单项选择题

A．They want to sleep well at night.
B．Their parents want them to do so.
C．They fall far behind the others.
D．They know that training is very important.
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单项选择题
A．It has been increasing since the Ice Age.B．It affected the growth of trees.C．It is determinated by the chemicals in the air.D．It follows a certain cycle.
A．It has been increasing since the Ice Age.
B．It affected the growth of trees.
C．It is determinated by the chemicals in the air.
D．It follows a certain cycle.
单项选择题
A．The assignment looks easy but actually it’s quite difficult.B．They have plenty of time to work on the assignment.C．The assignment is too difficult for them to complete on time.D．They cannot finish the assignment until Thursday.
A．The assignment looks easy but actually it’s quite difficult.
B．They have plenty of time to work on the assignment.
C．The assignment is too difficult for them to complete on time.
D．They cannot finish the assignment until Thursday.
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