单项选择题

What important discovery about seismic waves does the instructor mention

A．They occur at regular intervals.
B．They can withstand great heat.
C．They travel through the Earth's interior.
D．They can record the Earth's internal temperatur

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单项选择题

What does the man want the woman to do

A．Meet his anthropology teacher.
B．Lend him her magazine when she's clone with it.
C．Come over to his house after class.
D．Help him study for an anthropology test.

单项选择题

How did people in the early Ice Age keep warm

A．They lived in large groups.
B．They used sand as insulation.
C．They kept fires burning constantly.
D．They faced their homes toward the sout