单项选择题

All ______ is a continous supply of the basic necessities of life.

A．what is needed
B．for our needs
C．the thing needed
D．that is needed
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单项选择题
The United States is composed of 50 states , two of which are separated from ______ by land or water.
A．others
B．other one
C．the others
D．another
单项选择题
Watch the coach (教练员) ______ you how ______ in water.
A．to show... to breathe
B．showing... to breathe
C．show... breathing
D．show... to breathe
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