单项选择题

Plants can absorb the carbon dioxide through their ______ during the sunlight hours and produce oxygen which human beings need to survive.

A．slots
B．hoses
C．pores
D．sponges
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单项选择题
President John Kennedy was ______ in Dallas in 1963.
A．slaughtered
B．assassinated
C．suicided
D．massacred
单项选择题
In the past several years, the representatives of the two countries have met frequently to discuss ______ issues.
A．a cluster of
B．a host of
C．a flock of
D．a bunch of
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