【题目】Artemisinin (青蒿素) was first________ by Chinese scientist Tu Youyou in the 1970s.
A.inventedB.createdC.producedD.discovered
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【题目】Mary is a pretty girl in our class__________always likes to help others.
A.whoB.whoseC.whom
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【题目】Extreme sports such as rock climbing can be very dangerous, so we________ be too careful.
A.can’tB.mustn’tC.shouldn’tD.needn’t
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【题目】— How do you find the price now?
— As a________rule, prices follow needs.
A.privateB.generalC.centralD.fixed
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【题目】Don't be afraid of asking for help when you are in trouble, because only in this way can you make _______ step by step.
A.successB.abilityC.progressD.choice
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【题目】How did the man go to Quanzhou last spring?
A.By train.B.By plane.C.By ship.
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【题目】John decided to buy a brown tie from the shop to_______________(与……相配)his new shirt.
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