单项选择题

A．They will face extinction without artificial reproduction.
B．They will have to migrate to find new homes.
C．They will be able to survive in the preserves.
D．They will gradually die out.
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单项选择题
A．The company has trouble printing a schedule.B．The speakers arrived at the station late.C．The train seldom arrives on time.D．The schedule has been misprinted.
A．The company has trouble printing a schedule.
B．The speakers arrived at the station late.
C．The train seldom arrives on time.
D．The schedule has been misprinted.
单项选择题
Mouthwashes are not an effective cure for bad breath mainly because______.
A．they can’’t mask the bad odor long enough
B．they can’’t get to all the offending bacteria
C．their strong smell mixes with bad breath and makes it worse
D．they can’’t cover the thick layers of mucus
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