单项选择题

Next semester, Susan must take three compulsory courses.

A．formal
B．voluntary
C．practical
D．required
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单项选择题
The temperatures are somewhat lower than the average temperature in May this year.
A．rather
B．very
C．a little
D．less
单项选择题
He must not allow this unusual barrier to stop him from fighting against the enemy.
A．interior
B．obstacle
C．interruption
D．interference
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