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 needed an electrician.B．The water was running.C．He had no hot water.D．There was no heat.
A．He needed an electrician.
B．The water was running.
C．He had no hot water.
D．There was no heat.
单项选择题
A．They know what they want to buy.B．They have little money to spend.C．They talk themselves out of purchases.D．They shop at the cheapest stores.
A．They know what they want to buy.
B．They have little money to spend.
C．They talk themselves out of purchases.
D．They shop at the cheapest stores.
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