单项选择题

A．They might eventually cause you to lose sleep.
B．They help produce a neurotransmitter in the brain.
C．You must not drink milk if you take them.
D．They make it unnecessary to take naps.
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单项选择题
A．He has to rearrange his evening schedule. B．His schoolwork takes up most of his time. C．He hasn’t been in a play for a long time. D．He might not like the way the group works.
A．He has to rearrange his evening schedule.
B．His schoolwork takes up most of his time.
C．He hasn’t been in a play for a long time.
D．He might not like the way the group works.
填空题
The creative destruction that has happened to blue-collar workers in the past also starts to affect the cognitive elite.
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