I can't help () about what he said once again.
A. thinking
B. thought
C. to think
D. have thought
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Much () ,TV sets are being produced in larger and larger quantities every year.
A. being needed
B. needing
C. needed
D. having needed
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
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