单项选择题

The key to success is remembering that every hurdle crossed is one less hurdle in the （） of your personal ambition.

A. pursuit
B. proportion
C. promotion
D. propulsion

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单项选择题
The author argues that there is more diversity of life in the sea than in the rain forest because ______.
A. there are too many insects to make meaningful distinctions
B. more phyla and classes of life are represented in the sea
C. many insect species are too small to divide into categories
D. marine life-forms reproduce at a faster pace
单项选择题
This is the industrialist’s （）, invest, and risk going bankrupt, or not invest and risk losing your share of the market.

A. paradox
B. junction
C. premise
D. dilemma
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