单项选择题

In the family of FETs, you can expect to find .

A．All of the above
B．an n-channel type
C．a p-channel type
D．unipolar structure

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单项选择题

控制呼吸的基本中枢位于脊髓。（）

A．对
B．错

多项选择题

Below is a sales pitch for a designer perfume. What verbal strategies are used?

A．Alliteration
B．Rhyming
C．Concrete words
D．Repetition of words