题目内容

phrase: 艰难费力地通过；吃力地钻研；费力地阅读

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phrase: （迅速伸手）抓住

放松自己；放纵自我

突然出现；冒出来

Thenew aircraft has performde very well in its _tyial.

A. first
B. second
C. core
D. initial