单项选择题

As to the living environment, bacteria’s needs vary, but most of them grow best in a slightly acid ___________.

A．mechanism
B．miniature
C．medium
D．means
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单项选择题
As usual, Singapore Airlines will reduce trans-pacific capacity in _________ seasons this year.
A．stern
B．slack
C．sumptuous
D．glamorous
单项选择题
Having a bird’s eye view from the helicopter, the vast pasture was __________ with beautiful houses.
A．overlapped
B．segregated
C．intersected
D．interspersed
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