单项选择题

The teacher has______catering to some students, but to retain his tenure, which effects only after a teacher has unanimously gratified his students, he offers his complaints______.

(A) a hesitancy about … carelessly
(B) an aptitude for … sparingly
(C) a repugnance toward … tactfully
(D) an enthusiasm about … zealously
(E) a blitheness about … carefully
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单项选择题
Although scientists have______long the human appendix as______organ, there is a growing body of evidence indicating that the appendix does in fact have a significant function as a part of the body’s immune system.
(A) overestimated … a minor
(B) discounted … a vestigial
(C) valued … a major
(D) ignored … a pivotal
(E) studied … an inaccessible
单项选择题
Current estimates put thirteen percent of global flora at risk of extinction, but this number does not include______plants from tropical regions, where the majority of the world’s plants grow.
(A) apocryphal
(B) deciduous
(C) rare
(D) innumerable
(E) vanished
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