Ở nhiệt độ thường, nhỏ vài giọt dung dịch iot vào hồ tinh bột thấy xuất hiện màu

A. nâu đỏ

B. vàng

C. hồng

D. xanh tím

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 35 to 42.

Biological diversity has become widely recognized as a critical conservation issue only in the past two decades. The rapid destruction of the tropical rain forests, which are the ecosystems with the highest known species diversity on Earth, has awakened people to the importance and fragility of biological diversity. The high rate of species extinctions in these environments is jolting, but it is important to recognize the significance of biological diversity in all ecosystems. As the human population continues to expand, it will negatively affect one after another of Earth's ecosystems. In terrestrial ecosystems and in fringe marine eco common problem is habitat destruction. In most situations, the result is irreversible. Now humans are beginning to destroy marine ecosystems through other types of activities, such as disposal and runoff of poisonous waste; in less than two centuries, by significantly reducing the variety of species on Earth, they have irrevocably redirected the course of evolution.

Certainly, there have been periods in Earth's history when mass extinctions have occurred. The extinction of the dinosaurs was caused by some physical event, either climatic or cosmic. There have also been less dramatic extinctions, as when natural competition between species reached an extreme conclusion. Only 0.01 percent of the species that have lived on Earth have survived to the present, and it was largely chance that determined which species survived and which died out.

However, nothing has ever equaled the magnitude and speed with which the human species is altering the physical and chemical world and demolishing the environment. In fact, there is wide agreement that it is the rate of change humans are inflicting, even more than the changes themselves that will lead to biological devastation. Life on Earth has continually been in flux as slow physical and chemical changes have occurred on Earth, but life needs time to adapt-time for migration and genetic adaptation within existing species and time for the proliferation of new genetic material and new species that may be able to survive in new environments.

According to the passage, natural evolutionary change is different from change caused by humans in that changes caused by humans ________ .

A. are occurring at a much faster rate

B. affect fewer ecosystems

C. are less devastating to most species

D. are reversible

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 35 to 44

Here are tips that help succeed in your job interview:

Always arrive early. If you do not know (35) ______ the organization is located, call for exact directions (36) ______ advance. Leave some extra time for any traffic, parking, or (37) ______ events. If you are running late, call right away and let someone know. The best time to arrive is approximately 5 - 10 minutes early. Give (38) ______ the time to read your resume one more time, to catch your breath, and to be ready for the interview. Once you are at the office, treat everyone you encounter with respect. Be (39) ______ to everyone as soon as you walk in the door.

Wear a professional business suit. This point should be emphasized enough. First (40) ______ are extremely important in the interview process. Women should (41) ______ wearing too much jewelry or make up. Men should avoid flashy suits or wearing too much perfume. It is (42) ______ important that you feel comfortable. While a suit is the standard interview attire in a business environment, if you think it is (43) ______ informal environment, call before and ask. Regardless, you can never be overdressed (44) ______ you are wearing a tailored suit.Question 35

A. why

B. when

C. where

D. that

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 38 to 42. Fill in the appropriate word in question 38

        The popular image of student life is of young people with few responsibilities enjoying themselves and (38) _____ very little work. This is often not true. Many older people now study at college or university, sometimes (39) _____ a part-time basis while having a job and looking after a family. These students are often highly motivated and work very hard.

        Younger students are often thought to be lazy and careless about money (40) _____ this situation is changing. In Britain reduced government support for higher education means that students can no longer rely on having their expenses paid for them. Formerly, students received a grant towards their living expenses. Now most can only get a loan (41) _____ has to be paid back. Since 1999 they have paid over £1,000 towards tuition fees and this amount will increase up to a maximum of £3,000. In the US students already have to pay for tuition and room and board.

        Many get a financial aid package which may include grants, scholarships and loans. The fear of having large debts places (42) _____ pressure on students and many take part-time jobs during the term and work full-time in the vacations.

A. carrying

B. producing

C. making

D. doing

Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions from 28 to 29.

A. deficiency

B. variation

C. equality

D. intelligence

Read the following passage and decide which answer bestfits each gap. Write your answer in the numbered box.

    Voluntary work is work that you do not get paid for and usually involves in doing things to help other people, especially the elderly or the sick. or working on (12)__________of a charity or similar organization. Most charitable organizations rely on unpaid volunteers, and thousands of Americans and British people give many hours of their time to doing some form of social work or organizing - fund raising events to support the work. Volunteering is especially popular in the US and the reasons this may be found in (13)__________American values such as the Protestant work ethic, the idea that work improves the person whodoes it, and the belief that people can change their (14)__________if they try hard enough.

    In the US young people over 18 can take part in AmeriCorps, a government programme that (15)__________them to work as volunteers for a period of time, with the (26)__________of help in paying for their education later. Older Americans who do not work may spend much of their free time volunteering.

Điền vào số (16)

A. function 

B. reply       

C. favour    

D. promise

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions from 10 to 21.

Sara bought in a lot of business last month; she should ask for a pay rise while she’s still on a _____.

A. roam

B. roll

C. rush

D. run

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions from 10 to 21.

Children shouldn’t be allowed ____ time ____ computer games.

A. waste - to play

B. to waste - playing

C. wasting – playing

D. to waste - to playing

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 3 to 9.

        Most people can remember a phone number for up to thirty seconds. When this short amount of time elapses, however, the numbers are erased from the memory. How did the information get there in the first place? Information that makes its way to the short term memory (STM) does so via the sensory storage area. The brain has a filter which only allows stimuli that is of immediate interest to pass on to the STM, also known as the working memory.

        There is much debate about the capacity and duration of the short term memory. The most accepted theory comes from George A. Miller, a cognitive psychologist who suggested that humans can remember approximately seven chunks of information. A chunk is defined as a meaningful unit of information, such as a word or name rather than just a letter or number. Modern theorists suggest that one can increase the capacity of the short term memory by chunking, or classifying similar information together. By organizing information, one can optimize the STM, and improve the chances of a memory being passed on to long term storage.

        When making a conscious effort to memorize something, such as information for an exam, many people engage in "rote rehearsal". By repeating something over and over again, one is able to keep a memory alive. Unfortunately, this type of memory maintenance only succeeds if there are no interruptions. As soon as a person stops rehearsing the information, it has the tendency to disappear. When a pen and paper are not handy, people often attempt to remember a phone number by repeating it aloud. If the doorbell rings or the dog barks to come in before a person has the opportunity to make a phone call, he will likely forget the number instantly. Therefore, rote rehearsal is not an efficient way to pass information from the short term to long term memory. A better way is to practice "elaborate rehearsal". This involves assigning semantic meaning to a piece of information so that it can be filed along with other pre-existing long term memories.

        Encoding information semantically also makes it more retrievable. Retrieving information can be done by recognition or recall. Humans can easily recall memories that are stored in the long term memory and used often; however, if a memory seems to be forgotten, it may eventually be retrieved by prompting. The more cues a person is given (such as pictures), the more likely a memory can be retrieved. This is why multiple choice tests are often used for subjects that require a lot of memorization.

All of the following are mentioned as places in which memories are stored EXCEPT______.

A. maintenance area

B. long term memory

C. sensory storage area 

D. STM