单项选择题

Too much ______ to radiation can cause cancer or other damage to the body.

A．contact
B．exposure
C．disclosure
D．exhibition

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单项选择题

Lover of towns ______ I am, I realize that I owe a debt to my early country life.

A．because
B．where
C．who
D．as

单项选择题

The book will show the readers ______ can be used in other contexts.

A．that how have they observed
B．how that they have observed
C．that they have observed
D．how what they have observed

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