单项选择题

What did P and S waves help scientists discover about the layers of the earth

A．How deep they are.
B．Where earthquakes form.
C．How hot they are.
D．What purpose they serve.
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单项选择题
A．makeB．persuadeC．causeD．tell
A．make
B．persuade
C．cause
D．tell
单项选择题
According to the news, where is the center of the quake
A．In India.
B．In Pakistan.
C．In Indian Kashmir.
D．In Pakistani-controlled Kashmir.
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