单项选择题

Passage Two

A. The building method the builders use to save energy.
B. The limit of the flow of air between inside and outside.
C. The use of man-made building materials.
D. The limit of air-flow and the man-made materials.
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单项选择题
A. It helps improve the physical health.B. It is good for a sound sleep.C. It helps develop mental toughness.D. It helps lose weight.

A. It helps improve the physical health.
B. It is good for a sound sleep.
C. It helps develop mental toughness.
D. It helps lose weight.
单项选择题
A. To inquire about switching majors.B. To find a helping supervisor.C. To make up the remaining credits.D. To apply for a master’s degree.

A. To inquire about switching majors.
B. To find a helping supervisor.
C. To make up the remaining credits.
D. To apply for a master’s degree.
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