单项选择题

Chemists, physicists and mathematicians are ______ known as scientists.

A．alternatively
B．cognitively
C．exclusively
D．collectively
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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
单项选择题
President John Kennedy was ______ in Dallas in 1963.
A．slaughtered
B．assassinated
C．suicided
D．massacred
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