单项选择题

The word "they" in line 4, paragraph 1 refers to ______.

A．seasonal changes
B．natural forces
C．theories
D．human beings
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单项选择题
The girl wanted to borrow a pen, because ______.
A．she had not brought a pen with her
B．she had lost her own on her way to school
C．there was something wrong with her own
D．her own had been taken away by someone
单项选择题
The teacher saw all this, so she asked the boy ______.
A．to go on writing his paper
B．to stop whispering
C．to leave the room immediately
D．to stay behind after the exam
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