单项选择题

Questions 27-30

A．An occupation.
B．A hobby.
C．A sport.
D．A pastime.
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单项选择题
It can be concluded that a concentration of carbon dioxide in the atmosphere would ______.
A．prevent the sun’s rays from reaching the earth’s surface
B．mean a warming up in the Arctic
C．account for great changes in the climate in the northern hemisphere
D．raise the temperature of the earth’s surface
单项选择题
A．There are not equal numbers of males and females.B．The sample pool is too small.C．The questionnaire survey fails to include enough questions.D．The students didn’t give definite answers to the questions.
A．There are not equal numbers of males and females.
B．The sample pool is too small.
C．The questionnaire survey fails to include enough questions.
D．The students didn’t give definite answers to the questions.
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