单项选择题

A．Traveling a lot.
B．Getting a lot of exercise.
C．Working too hard.
D．Waiting for the train.
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单项选择题
A．Art history.B．Elementary education.C．American literature.D．Psychology.
A．Art history.
B．Elementary education.
C．American literature.
D．Psychology.
单项选择题
A．Because it changes color in a regular 24-hour rhythm.B．Because it changes color in response to the sun’s rays.C．Because it constantly changes color.D．Because it changes color every hour.
A．Because it changes color in a regular 24-hour rhythm.
B．Because it changes color in response to the sun’s rays.
C．Because it constantly changes color.
D．Because it changes color every hour.
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