单项选择题

Questions 1 to 5 are based on the following conversation.

A． They are a group of astronauts.
B． They are several scientists who are interested in the moon.
C． They are a group of scientists and engineers who study Mars.
D． They are NASA staff.
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单项选择题
A． The unusual habits of the centenarians.B． How to live to be 100C． The incredible groups of senior citizens.D． How to be young forever
A． The unusual habits of the centenarians.
B． How to live to be 100
C． The incredible groups of senior citizens.
D． How to be young forever
单项选择题
A． Blizzard.B． Airplane crash.C． Heavy rain.D． Tsunami.
A． Blizzard.
B． Airplane crash.
C． Heavy rain.
D． Tsunami.
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