单项选择题

—This wall of air is an effective answer to the problem and it ______ work.
—But it is a question to put such a wall of air around the statue.

A. may



B. must
C. should



D. could
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单项选择题
We are going to discuss the way of reading works ______ it is used for real life purposes, and this should give you a better understanding of it.
A．that
B．which
C．where



D．when
单项选择题
Scientists say they have found a way to produce the human body's own cancer-killing cells through gene treatment, ______ new hope to cancer sufferers.
A．offering
B．showing
C．taking
D．making
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