单项选择题

The compulsory courses refer to those that you have to take.

A. simple
B. voluntary
C. practical
D. required
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When the heat accumulates in the room, it will become so hot.
A. elects
B. collects
C. selects
D. reflects
单项选择题
Floods have undermined the foundation of the ancient bridge.
A. destroyed
B. reached
C. broaden
D. covered
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