单项选择题

A．It can be seen from an airplane.
B．It’s most likely polluted.
C．It’s usually a bright green color.
D．The supply of it may be exhausted soon.
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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.
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.
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.
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