Câu hỏi:
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.
It’s a sound you will probably never hear, a sickened tree sending out a distress signal. But a group of scientists has heard the cries, and they think some insects also hear the trees and are drawn to them like vulture to a dying animal. Researchers with the US Department of Agriculture’s Forest Service fastened sensors to the bark of drought-stricken trees clearly heard distress calls. According to one of the scientists, most parched trees transmit their plight in the 50-hertz to 50kilohertz range. (The unaided human ear can detect no more than 20 kilohertz). Red oak, maple, white pine, and birch all make slightly different sounds in the form of vibrations at the surface of the wood.
The scientists think that the vibrations are created when the water columns inside tubes that run along the length of the tree break, a result of too little water following through them.
These fractured columns send out distinctive vibration patterns. Because some insects communicate at ultrasonic frequencies, they may pick up the trees' vibration and attack the weakened trees. Researchers are now running tests with potted trees that have been deprived of water to see if the sound is what attracts the insects. “Water-stressed trees also smell differently from other trees, and they experience thermal changes, so insects could be responding to something other than sound”, one scientist said.
Question: It can be inferred from the passage that research concerning the distress signals of trees______.
A. has been unproductive up to now
B. is no longer sponsored by the government
C. was conducted many years ago
D. is continuing
Câu 1: Mark the letter A, B, C or D on your answer sheet to indicate the best answer of each following questions.
Tom and May never help at home. The reason is because their mother never asks to.
A. Tom and May never help at home and their mother never asks to.
B. Tom and May never help at home because their mother never asks to.
C. Tom and May never help at home so their mother never asks to.
D. In order not to help at home by Tom and May, their mother never asks.
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Câu 2: Mark the letter A, B, C or D on your answer sheet to indicate the most suitable respone to complete each of the following exchanges.
Mary: “Our team has just won that English Competition.” - Anne: “_____”
A. Good ideas. Thanks for the news.
B. Well, that’s very surprising
C. Yes, I guess it’s very good
D. Yes, it’s our pleasure
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Câu 3: Mark the letter A, B, C or D on your answer sheet to indicate the best answer of each following questions.
“You stole my best cassette, Bob.” said Willy.
A. Willy accused Bob on stealing his best cassette.
B. Willy accused Bob for stealing his best cassette.
C. Willy accused Bob at stealing his best cassette.
D. Willy accused Bob of stealing his best cassette.
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Câu hỏi trong đề: Đề thi giữa kì 2 Tiếng Anh 12 có đáp án (Đề 1)
- 4 Lượt thi
- 45 Phút
- 35 Câu hỏi
- Học sinh
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