单项选择题

In ancient times, some catastrophic extinction of species occurred ______.

A. sequentially
B. repeatedly
C. naturally
D. intentionally
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单项选择题
The gap between those at the lowest level and those at the highest level of income had increased ______, and is continuing to increase.
A. substantially
B. successfully
C. succinctly
D. sufficiently
单项选择题
The republication of the poet’s most recent works will certainly ______ his national reputation.
A. magnify
B. strengthen
C. enlarge
D. enhance
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