题目内容

This passage is mainly about how to （）

A. use the passages in a reading course
B. improve reading speed
C. develop reading comprehension
D. make a good use of the library

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It has been rather costly to install the machinery, but it will prove to be worth the money ______

A. in conclusion
B. in the long run
C. in case
D. at the end

The situation today is obviously quite different from ______ it was only 50 years ago.

A. which
B. what
C. when
D. such

79（）

A. healthy
B. expensive
C. clean
D. common

71（）

A. true
B. possible
C. clear
D. polite