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 classifystars 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
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