Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 17 to 21.
We need energy to live and work. Our major source of (17) _________is oil. Oil is one kind of fossil fuel. The amount of fossil fuels in the world is (18) _________. Therefore, we must save it, and at the same time, we must find new sources of energy. Geothermal heat and nuclear power are alternative (19) _________of energy. They can give us electricity. Other alternative sources (20) _________ the sun, waves and water. These sources are not only unlimited and available (21)_________clean and safe for the environment. People should develop and use them more and more in the future.
A. oil
B. fuel
C. heat
D. energy
Giải bởi Vietjack
Chọn đáp án D.
Giải thích: Chỗ trống cần 1 danh từ, dựa vào nghĩa chọn đáp án D
source of energy: nguồn năng lượng
Dịch: Nguồn năng lượng chính của chúng ta là dầu mỏ.
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
The people who wish to go on the tour are waiting in the lobby.
Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.
Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions.
In order to show that learning to write requires effort, the author gives the example of ______.
Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions.
Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.
These sources are not only unlimited and available (21)_________clean and safe for the environment.
