1、 Both of the drivers were injured in the collision.

(A) hindrance (B)cry (C)crash

2、 Janet’s job as an assistant at the Harvard University observatory was to classify stars according to their spectra.

(A) locate (B)photograph (C)categorize

3、In aerospace programs, helium(氦)is used to chill rocket engines prior to the launch.

(A) cool (B) fuel (C) test

4、Ballet is theatrical entertainment that combines the arts of dancing, stage design, and music.

(A) replaces (B) promotes (C) blends

答案：CCAC

详解：

Crash

n. 撞碎;坠毁;破产;轰隆声;睡觉英语四级报名时间

vi. 摔碎;坠落;发出隆隆声;(金融企业等)破产

vt. 打碎;使坠毁、撞坏;擅自闯入

He narrowly escaped in the air crash.

他险些在飞机失事中遇难。

categorize

vt. 分类

This mirrors the way we categorize things in the real world.

这反映了我们在现实世界中分类事物的方法。

cool

adj. 凉爽的;冷静的;出色的

vt. 使…冷却;使…平静下来

vi. 变凉;平息

n. 凉爽;凉爽的空气

adv. 冷静地

The cool autumn wind clarified my mind.

凉爽的秋风使我的头脑清醒过来。

blends

n. 混纺，混纺纤维;混合物(blend的复数形式)

vt. 使交融(blend的三单形式);使混合，使混杂

Water does not blend with oil.

水和油不能混合。