单项选择题

A．How winds affect temperature.
B．Reasons for sudden increases in wind.
C．The origin of storm systems.
D．How vertical air movement influences weather.
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单项选择题
A．It is not as bad as it used to be.B．Americans do not want to give up any more sleep.C．Americans guarantee to change the sleeping habits.D．Americans want to know just how bad it is to their health.
A．It is not as bad as it used to be.
B．Americans do not want to give up any more sleep.
C．Americans guarantee to change the sleeping habits.
D．Americans want to know just how bad it is to their health.
单项选择题
A．The man should also concern his academic grades.B．The man should continue to improve his soccer skills.C．There’s no need for the man to improve his soccer skills.D．The man’s academic grades have begun to improve recently.
A．The man should also concern his academic grades.
B．The man should continue to improve his soccer skills.
C．There’s no need for the man to improve his soccer skills.
D．The man’s academic grades have begun to improve recently.
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