单项选择题

There ought to be less anxiety over the perceived risk of getting cancer than ______ in the pub lie today.

A．exists
B．exist
C．existing
D．existed
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单项选择题
And while we ______ have a great deal of trouble adjusting to a climate that gets 2 degrees Centigrade warmer over the next century, an ice age by mid-century ______ be unimaginably devastating.
A．might, could
B．could, might
C．would, might
D．might, would
单项选择题
The concern (has been) that the embryo bank (might be) exploited (by unscrupulous), or that conception might precede birth by nine or even ninety years, (rather than) by nine months.
A．has been
B．might be
C．by unscrupulous
D．rather than
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