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 word or phrase that is CLOSEST in meaning to the underlined part in each of the following.
When being interviewed, you should concentrate on what the interviewer is saying or asking you.
A. relate on
B. be interested in
C. impress on
D. pay attention to
30/11/2021 0 Lượt xem
Câu 2: Mark the letter A, B, C, D on your answer sheet to indicate the word whose underlined part differs from that of the other three in pronunciation in each of the following questions:
A. return
B. human
C. university
D. future
30/11/2021 0 Lượt xem
30/11/2021 0 Lượt xem
30/11/2021 0 Lượt xem
Câu 5: Mark the letter A, B, C or D on your answer sheet to indicate the word or phrase that is CLOSEST in meaning to the underlined part in each of the following.
The teacher gave some suggestions on what would come out for the examination.
A. symptoms
B. demonstrations
C. effects
D. hints
30/11/2021 0 Lượt xem
Câu 6: 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.
He had never experienced such discourtesy towards the president as it occurred at annual meeting in May.
A. encouragement
B. rudeness
C. measurement
D. politeness
30/11/2021 0 Lượt xem

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
Cùng danh mục Đề thi Tiếng Anh 12
- 413
- 22
- 15
-
98 người đang thi
- 433
- 8
- 35
-
41 người đang thi
- 719
- 9
- 15
-
58 người đang thi
Chia sẻ:
Đăng Nhập để viết bình luận