单项选择题

—The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job
—（）my students have a try

A. Shall
B. Must
C. Will
D. May

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单项选择题
—What's the matter with you —After the long walk, my leg ______ and I couldn't go any further.
A. gave out



B. gave off
C. gave in



D. gave up
单项选择题
Many people keep dogs as pets because dogs are regarded as（）friends to people.

A. lonely
B. only
C. loyal
D. fair
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