Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

Transportation has been made much easier thanks to the invention of cars. However, cars are the greatest contributor of air pollution

A. The invention of cars has made transportation much easier, but cars are among the greatest contributors of air pollution

B. Although the invention of cars has made transportation much easier, people use cars to contribute to the pollution of air

C. Although the invention of cars has made transportation much easier, cars are the greatest contributor of air pollution

D. However easier the invention of cars has made transportation, it is cars that are among the greatest contributors of air pollution

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer for 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. 
Question:Which of the following statements about the use of chemical agents as herbicides would the author most likely agree?

A. It has become more dangerous recently.

B. It is occasionally required.

C. It is safe but inefficient.

D. It should be increased.

Một số loài cây chịu được khô hạn trong thời gian dài mà không ảnh hưởng tới quang hợp. Đặc điểm nào sau đây giúp cây có khả năng đó?

A. Hệ thống rễ phát triển tốt.

B. Thế nước của lá cây rất thấp.

C. Đóng khí khổng.

D. Tế bào bao bó mạch chứa lục lạp.

Trong các trường hợp sau, trường hợp nào không xảy ra ăn mòn điện hoá

A. Nhúng thanh Cu trong dung dịch Fe₂(SO₄)₃ có nhỏ một vài giọt dung dịch H₂SO₄

B. Sự ăn mòn vỏ tàu trong nước biển

C. Nhúng thanh Zn trong dung dịch H₂SO₄ có nhỏ vài giọt CuSO₄

D. Sự gỉ của gang thép trong tự nhiên

Hằng ngày, phụ nữ uống viên thuốc tránh thai (chứa prôgestêrôn hoặc prôgestêrôn + ơstrôgen) có thể tránh được mang thai, tại sao?

Một điện thoại di động hãng Blackberry Pastport được treo bằng sợi dây cực mảnh trong một bình thủy tinh kín đã rút hết không khí. Điện thoại dùng số thuê bao 0977 999 xxx vẫn đang nghe gọi bình thường và được cài đặt âm lượng lớn nhất. Học sinh A đứng gần bình thủy tinh trên và dùng một điện thoại Iphone X gọi vào thuê bao 0977 999 xxx. Kết quả học sinh A nhận được là:

A. Nghe thấy nhạc chuông nhưng nhỏ hơn bình thường

B. Vẫn liên lạc được nhưng không nghe thấy nhạc chuông

C. Nghe thấy nhạc chuông  như bình thường

D. Chỉ nghe một cô gái nói: “Thuê bao quý khách vừa gọi tạm thời không liên lạc được, xin quý khách vui lòng gọi lại sau”.

Làm câu hỏi thì trình bày cho thuận mắt hộ tý cứ liền một khối thế kia thì ai đọc được

Hòa tan hết 5,6 gam Fe bằng một lượng vừa đủ dung dịch HNO₃ đặc nóng thu được V lít NO₂ là sản phẩm khử duy nhất (đktc). V có giá trị nhỏ nhất là

A. 1,12 lít

B. 2,24 lít

C. 4,48 lít

D. 6,72 lít

Hỗn hợp X gồm vinyl axetat, metyl acrylat và metyl axetat. Đốt cháy hoàn toàn 3,32 gam X, thu được 3,36 lít CO₂ (đktc). Phần trăm số mol của metyl axetat trong X là 

A. 72,08% 

B. 25% 

C. 75% 

D. 27,92%

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

In the USA, the UK and many other countries, a lot of babies were born in the “baby boom” of the late 1940s and 1950s; after that the birth-rate fell. Baby boomers have now retired, or are approaching retirement, and this is causing headaches for many organizations: there are not enough people to succeed their top managers when they retire.

Does your organization have key staff who can’t easily be replaced? A CEO or financial director, perhaps, or a technical expert with knowledge that nobody else in the organization has. If your answer is “yes”, what will happen when they retire, or leave for another company? Will you wait until the last moment before looking for someone to replace them? Or is your organization thinking about likely future changes now, as it should be, and making plans, so that there is likely to be someone ready to replace the person leaving? If the answer is that you are planning ahead, your organization is carrying out succession planning.

Succession planning means looking inside the organization for “high-fliers” - current staff members with the potential to fill key positions - and planning the training, responsibilities and promotion they need, to make them ready when a senior vacancy occurs - which may not be for several years. The company benefits by being able to make an internal promotion when a key person leaves, and in the meantime it benefits by developing the skills of its high-fliers and encouraging them to stay. And the high-fliers benefit, because they achieve their full potential, a career is planned for them within the organization, and they can look forward to a senior post in time.

The training program planned for the high-fliers will help them to develop the leadership skills they need for more senior roles, skills such as planning long-term strategies. A career path is also planned, so that each high-flier moves into a number of different positions over a few years, to gain the experience and know ledge they need.

Sometimes a staff member is chosen as a potential successor to a particular senior manager, but a better method is for organizations to select a number of high-fliers, and prepare them for a range of senior roles. An organization can’t be certain when a particular senior manager will leave. Having a group of people being prepared fee top positions makes it easier to replace someone who leaves unexpectedly, and also means that there are other people available if a high-flier leaves the company.

What does the passage mainly discuss?

A. Succession planning is beneficial in many ways. 

B. Encouraging high-flier to stay is a key to success. 

C. There are typical strategies to improve skills for staff. 

D. Making successful plans is extremely hard.