Much () ,TV sets are being produced in larger and larger quantities every year.
A. being needed
B. needing
C. needed
D. having needed
查看答案
轴的的键槽与孔内键槽加工方法是不一样的，通常是铣削加工
A. 对
B. 错
According to the video, why did the narrator call Tu an "exceptional scientist"?
A. introducing radium to the world
B. willing to risk her own life to find a cure for malaria
C. inventing artemisinin
D. finding a cure for artemisinin
Where did Tu's quest for artemisinin begin?
A. in China
B. in America
C. in Vietnam
D. in Russia
Which species is the third enemy for soldiers on both sides of the Vietnam War?
A. rats
B. cockroach
C. bats
D. mosquitoes
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