单项选择题

A．Why it is difficult to use aerial photographs in research.
B．Why oceanic research is so limited.
C．How oceanic research has helped land research.
D．How fossil remains are obtained from deep sea.
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单项选择题
A．He’ll give the man a few prescriptions right away. B．He’ll be away from the office for one or two days. C．The woman doesn’t need anything for her cough. D．The woman should continue taking the medicine.
A．He’ll give the man a few prescriptions right away.
B．He’ll be away from the office for one or two days.
C．The woman doesn’t need anything for her cough.
D．The woman should continue taking the medicine.
单项选择题
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 temperature.
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 temperature.
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