单项选择题

The concerns with the origins of the earth ______ their study.

A．motivated
B．advised
C．excited
D．impulsed
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单项选择题
Children are ______ to have some accidents as they grow up.
A．obvious
B．indispensable
C．bound
D．doubtless
单项选择题
In Scotland, as in the rest of the United Kingdom, ______ schooling begins at age 5 and ends at age 16.
A．compelling
B．forced
C．obliged
D．compulsory
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