皮皮学，免费搜题
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【单选题】
Questions 5 to 7 are based on the news report you have just heard.A.
By tying it to a door handle.
B.
By shaking it back and forth.
C.
With a remote control craft.
D.
With a full-sized helicopter.
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【简答题】简述材料力学的研究任务。
【简答题】导乐分娩 :
【单选题】I think I have a healthy lifestyle. I eat a lot of fruit and vegetables, and I'm a ________ drinker.
A.
moderate
B.
heavy
C.
gradual
D.
delicate