单项选择题

The scientist ______ his great energy and endurance to his habit of, dozing off whenever he wanted.

A．contributed
B．attributed
C．devoted
D．distributed
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单项选择题
When I picked up the phone, I didn't recognize it was Anne. Her voice sounded ______ on the phone.
A．twisted
B．deformed
C．distorted
D．unregulated
单项选择题
Just take such books ______ are needed for teaching the freshmen.
A．that
B．which
C．as
D．what
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