单项选择题

Criticism and self-criticism are necessary__________they may help us to find out and correct our mistakes.

A. by that
B. at that
C. on that
D. in that

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单项选择题

English teachers often ask students to__________ a passage to get the gist of it.

A. skim
B. scan
C. predict
D. describe

单项选择题

Which of the following is closest in meaning to the underlinedword"detractors" in PARAGRAPHFOUR？

A. Urbanites.
B. Proponents.
C. Opponents.
D. Suburbanites.