单项选择题

Those twins are so alike that it is next to impossible to distinguish （）.

A．who is who
B．which is which
C．one and the other
D．one another

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单项选择题

In such desperate strains did he find himself that he was reduced to（） the violin in the streets.

A．play
B．playing
C．be playing
D．having played

单项选择题

（） at the outset, （） instead of shifting things about may be pheromones released when they reach committee size.（）

A．The stimuli set them off... build collectively
B．The stimuli that set them off... building collectively
C．The stimuli setting them off... they build collectively
D．Being set off by stimuli... their building collectively