单项选择题

At each end of the tube ______ , one which gathers light and one which magnifies the image.

A．are two lenses there
B．two lenses are
C．are two lenses
D．two lenses are there
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They've bought a holiday cottage near the sea, and in ______ course they plan to move there permanently.
A．due
B．future
C．coming
D．intended
单项选择题
He has devoted his life ______ disabled people.
A．to helping
B．to help
C．helping
D．help
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