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.

As a result of pollution, Lake Erie, on the borders of the USA and Canada, is now without any living things. Pollutions in water are not simply a matter of “poisons” killing large numbers of fish overnight. Very often the effects of pollution are not noticed for many months or years because the first organisms to be affected are either plants or plankton. But these organisms are the food of fish and birds and other creatures. When this food disappears, the fish and birds die in this way a whole food chain can be wiped out, and it is not until dead fish and water birds are seen at the river’s edge or on the sea shore that people realize what is happening. Where do the substances which pollute the water come from? There are two main sources – sewage and industrial waste. As more detergent is used in the home, so more of it is finally put into our rivers, lakes and seas.

Detergents harm water birds dissolving the natural substance which keep their feather waterproof. Sewage itself, if it is not properly treated, makes the water dirty and prevents all forms of life in rivers and the sea from receiving the oxygen they need. Industrial waste is even more harmful since there are many high poisonous things in it, such as copper and lead. So, if we want to stop this pollution, the answer is simple, sewage and industrial waste must be made clean before flowing into the water. It may already be too late to save some rivers and lakes, but others can still be saved if the correct action is taken at once.

Which of the following is harmful according to the passage?

A. industrial waste

B. water for cleaning

C. Chemicals

D. All of the above

Read the following passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.

          Global warming is the current increase in temperature of the Earth’s surface (both land and water) as well as its atmosphere. Average temperature around the world have risen by 0.75°C (1.4°F) (1) ______ the last 100 years. About two thirds of this increase has occured since 1975 in the past, when the Earth experienced increases in temperature it was the result of natural causes, but today it is being caused by accumulation of greenhouse gases in the atmosphere produced by human (2) ______.
          The natural greenhouse effect maintains the Earth’s temperature at a safe level making it (3) ______ for humans and many other life forms to exist. However, since The Industrial Revolution what benefits human has significantly enhanced the greenhouse effect (4) ______ the Earth’s average temperature to rise by almost 1°C. This is creating the global warming (5) ______we see today

Điền ô số 1

A. of

B. over

C. with

D. by

Cho m gam hỗn hợp Mg, Fe, Al₂O₃, Fe₃O₄ (trong đó oxi chiếm 20% về khối lượng) tan vừa đủ trong 140 gam dung dịch H₂SO₄ 61,6% đun nóng nhẹ, sau phản ứng thoát ra 6,048 lít hỗn hợp 2 khí H₂ và SO₂ có tỉ khối so với He là 10,833. Phần dung dịch thu được đem cho tác dụng với dung dịch NH₃ dư, thu được 45,52 gam kết tủa. Giá trị của m là

A. 34,40

B. 27,15

C. 32,00

D. 28,00

________, I would give a party

A. Should she come  next month

B. If she come next month

C. She were to come  next month

D. If she  came here now

Khi trùng hợp một ankađien X thu được polime M có cấu tạo như sau:

…-CH₂CH=CHCH₂CH₂CH= CHCH₂CH₂CH=CHCH₂-…

Công thức phân tử của monome X ban đầu là

A. C₃H₄

B. C₄H₆

C. C₅H₈

D. C₄H₈

Cho m gam ancol no, mạch hở X tác dụng hoàn toàn với CuO (dư) nung nóng, thu được hỗn hợp hơi Y ( có tỉ khối hơi so với H₂ là 47 3 ) có chất hữu cơ Z và thấy khối lượng chất rắn giảm 9,6 gam. Mặt khác, đốt a mol Z, thu được b mol CO₂ và c mol nước, với b = a + c. Phần trăm khối lượng oxi có trong X là:

A. 52,17%.

B. 34,78%.

C. 51,61%.

D. 26,67%.

Hình vẽ nào mô tả đúng cách thu khí O₂ bằng phương pháp đẩy không khí?

A. (II).

B. (IV).

C. (I). 

D. (III).

Thế nào là năng lượng?

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

“I am in a bit of hurry, but I’ll ring you tomorrow”, he said.

A. He said that he was very hurried, but that he would ring me tomorrow. 

B. He said he was a bit pressed for time, but that he would ring me the next day. 

C. He said that he was in a bit of hurry and rang me the following day. 

D. He said that he would ring me the next day as then he could.

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.

“Can I try out your new bicycle?” ~ “Be my guest.”

A. Sorry, you can’t

B. You’re kidding

C. Never mind

D. No problem.