题目内容

It was difficult to ____patients because of a shortage of medicine.

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I always keep a(n) ____in the boot of my car.

You may need to use ____to pick up the pieces from the wound.

Tu Youyou received the Nobel Prize in Medicine for discovering ____in 2015.

与（）面平行的空间直线称为水平线。

A. 无法确定
B. H
C. V
D. W