单项选择题

If a particular vaccine is produced only by one company at a single facility, there is a possibility that the supply of vaccine could grow______if the company decides to cease production.

A． useless
B． inexpensive
C． abstruse
D． repugnant
E． scarce
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单项选择题
The two reputable hydrogeologists drafted some highly optimistic projections-with the______that these were speculative and should of course be tested.
A． caveat
B． analysis
C． hypothesis
D． precis
E． imprimatur
单项选择题
CONIFER : NEEDLE ::
A． potato : tuber
B． cactus : spine
C． melon: gourd
D． bud : stalk
E． grove : timber
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