单选题A They might eventually cause you unable to sleep.B They help produce a substance that induces sleep.C You must not drink milk if you take them.D They make it unnecessary to take naps.
题目
单选题
A
They might eventually cause you unable to sleep.
B
They help produce a substance that induces sleep.
C
You must not drink milk if you take them.
D
They make it unnecessary to take naps.