What is the most important purpose of the ozone layer?
Giải bởi Vietjack
Đáp án B
Vai trò quan trọng nhất của tầng ozone là?
A. Bảo vệ mặt trời. B. Bảo vệ trái đất.
C. Phá huỷ chất hoá học. D. Cung cấp floruacacbon
“the ozone layer is the protective shield around the earth.” (tầng ozone là lớp chắn bảo vệ xung quanh trái đất.)
Như vậy vai trò của nó là bảo vệ trái đất.
The word “constrained” in paragraph 4 is closest in meaning to______.
According to the passage, who was the first person to use artificial refrigeration for a practical purpose?
What can be inferred from paragraph 1 about cold storage before the invention of artificial refrigeration?
The word "rough"in the passage is closest in meaning to ___________.
According to the passage, the first refrigerated railcar used what material as a cooling agent?
According to the passage, all of the following are true EXCEPT___________.
What is the main point the writer is trying to make in the last paragraph?
How did Juliette Davidson benefit from the experience of her first job?
Beta blockers work on some physical and emotional symptoms because they ________.
