单项选择题

It can not be denied that the existing resources on earth will be depleted, but scientists are______to concede the inevitability of that day,______that new energies can be found in the near future.

A． bound… assuming
B． unprepared … skeptical
C． hesitant… convinced
D． likely… realizing
E． eager … hypothesizing
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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
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
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