Viết vào chỗ chấm cho thích hợp:

b )   1 m 3   =   … … d m 3   =   … … c m 3 ;       2 d m 3   =   … … c m 3 3 d m 3   =   … … m 3 ;       4 c m 3   =   … … d m 3

Biểu đồ bên nói về số ngày có mưa trong ba tháng của năm 2004 ở huyện miền núi. Dựa vào biểu đồ hãy trả lời các câu hỏi sau:

a) Tháng 7 có bao nhiêu ngày mưa?

b) Tháng 8 mưa nhiều hơn tháng 9 bao nhiêu ngày?

c) Trung bình mỗi tháng có bao nhiêu ngày mưa?

Dựa vào Atlat Địa lí Việt Nam và kiến thức đã học, hãy so sánh sự giống nhan và khác nhau giữa hai vùng chuyên canh cây công nghiệp: Trung du và miền núi Bắc Bộ và Tây Nguyên. Giải thích vì sao có sự khác biệt về hướng chuyên môn hóa cây công nghiệp ở hai vùng trên?

Một con chim đại bàng bay trong 2,5 giờ được 225km. Một con kăng-ga-ru di chuyển trong 3 phút được 2520m. Hỏi mỗi phút con vậy nào di chuyển nhiều hơn và nhiều hơn bao nhiêu mét?

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word for each of the blanks.

Air  pollution  occurs  when  wastes  dirty  the  air.  People  produce  most  of  the  (44)  ______  that  cause  air pollution.  Such  wastes  can  be  in  the  form  of  gases  or  particles  of  solid  or  liquid  matter.  These  substances result chiefly from burning (45) _______ to power motor vehicles and to heat buildings. Industrial processes and the (46) _______ of garbage also contribute to air pollution. Natural pollutants (impurities) include dust, pollen, soil particles, and naturally occurring gases.

     The  rapid  growth  of  population  and  industry  and  the  increasing  use  of  automobiles  and  airplanes  have made air pollution a (47) _______ problem. The air we breathe has become so filled with pollutants that it can cause (48) _______ problems. Polluted air also harms plants, animals, building materials, and fabrics. In addition, it causes damage by altering the earth’s atmosphere.

Điền ô số 46

A. planting

B. burning

C. using

D. making

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.

        Herman Melville, an American author best known today for his novel Moby Dick, was actually more popular during his lifetime for some of his other works. He traveled extensively and used the knowledge gained during his travels as the basis for his early novels. In 1837, at the age of eighteen, Melville signed as a cabin boy on a merchant ship that was to sail from his Massachusetts home to Liverpool, England. His experiences on this trip served as a basis for the novel Redburn (1849). In 1841 Melville set out on a whaling ship headed for the South Seas. After jumping ship in Tahiti, he wandered around the islands of Tahiti and Moorea. This South Sea island sojourn was a backdrop to the novel Omoo (1847). After three years away from home, Melville joined up with a U.S. naval frigate that was returning to the eastern United States around Cape Horn. The novel White-Jacket (1850) describes this lengthy voyage as a navy seaman.

        With the publication of these early adventure novels, Melville developed a strong and loyal following among readers eager for his tales of exotic places and situations. However, in 1851, with the publication of Moby Dick, Melville's popularity started to diminish. Moby Dick, on one level the saga of the hunt for the great white whale, was also a heavily symbolic allegory of the heroic struggle of man against the universe. The public was not ready for Melville's literary metamorphosis from romantic adventure to philosophical symbolism. It is ironic that the novel that served to diminish Melville's popularity during his lifetime is the one for which he is best known today.

The word “metamorphosis” in paragraph 2 is closest in meaning to _________.

A. descent            

B. circle                

C. mysticism  

D. change

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.

Ever since humans inhabited the earth, they have made use of various forms of communication. Generally, this expression of thoughts and feelings has been in the form of oral speech. When there is a language barrier, communication is accomplished through sign language in which motions stand for letters, words, and ideas. Tourists, the deaf, and the mute have had to resort to this form of expression. Many of these symbols of whole words are very picturesque and exact and can be used internationally; spelling, however, cannot.

Body language transmits ideas or thoughts by certain actions, either intentionally or unintentionally. A wink can be a way of flirting or indicating that the party is only joking. A nod signifies approval, while shaking the head indicates a negative reaction.

Other forms of nonlinguistic language can be found in Braille (a system of raised dots read with the fingertips), signal flags, Morse code, and smoke signals. Road maps and picture signs also guide, warn, and instruct people.

Warn, and instruct people. While verbalization is the most common form of language, other systems and techniques also express human thoughts and feelings.

Sign language is said to be very picturesque and exact and can be used internationally EXCEPT for

A. spelling

B. ideas

C. whole words

D. expressions

Phát biểu nào sau đây là sai:

A. Khi hiđro hóa hoàn toàn chất béo lỏng sẽ thu được chất béo rắn.

B. Muối Na hoặc K của axit béo được gọi là xà phòng.

C. Xà phòng không thích hợp với nước cứng vì tạo kết tủa với nước cứng.

D. Trong phân tử triolein có 3 liên kết π.

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.

Humans have struggled against weeds since the beginnings of agriculture. Marring our gardens is one of the milder effects of weeds - any plants that thrive where they are unwanted. They clog waterways, destroy wildlife habitats, and impede farming. Their spread eliminates grazing areas and accounts for one-third of all crop loss. They compete for sunlight, nutrients, and water with useful plants.

The global need for weed control had been answered mainly by the chemical industry. Its herbicides are effective and sometimes necessary, but some pose serious problems, particularly if misused. Toxic compounds threaten animal and public health when they accumulate in food plants, groundwater, and drinking water. They also harm workers who apply them.

In recent years, the chemical industry has introduced several herbicides that are more ecologically sound. Yet new chemicals alone cannot solve the world's weed problems. Hence, scientists are exploring the innate weed-killing powers of living organisms, primarily insects and microorganisms.

The biological agents now in use are environmentally benign and are harmless to humans. They can be chosen for their ability to attack selected targets and leave crops and other plants untouched. In contrast, some of the most effective chemicals kill virtually all the plants they come in contact with, sparing only those that are naturally resistant or have been genetically modified for resistance. Furthermore, a number of biological agents can be administered only once, after which no added applications are needed. Chemicals typically must be used several times per growing season.

Which of the following statements about the use of chemical agents as herbicides would the author most likely agree?

A. It is occasionally required.                     

B. It is safe but inefficient.

C. It should be increased.                           

D. It has become more dangerous recently.

Viết các phương trình hóa học của các phản ứng sau: Tách một phân tử hidro từ phân tử propan.