1. The machine needs a complete ____ since it has been in use for over ten years.
(A) amending (B)fitting
(C) mending (D) renovating
2. There were many people present and he appeared only for a few seconds, so I only caught a ____ of him.
(A) glance (B) glimpse
(C) look (D) sight
3. I don't think it's wise of you to _____your greater knowledge in front of the director, for it may offend him.
(A) show up (B) show out
(C) show in (D) show off
4. The returns in the short ______ may be small, but over a number of years the investment will be well repaid.
(A) interval (B) range
(C) span (D) term
5. A thorough study of biology requires _____with the properties of trees and plants, and the habit of birds and beasts.
(A) acquisition (B) discrimination
(C) curiosity (D) familiarity
参考答案：CBDDB
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