单项选择题

They ______ us since five o'clock this morning until now.

A．are helping
B．help
C．have helped
D．have been helping

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单项选择题

The writer was always looking for suitable ______ to use in his next story.

A．contents
B．articles
C．pages
D．ideas

单项选择题

According to the passage which of the following would produce the LEAST amount of heat

A．A fat female who studies hard.
B．A thin female who does not study.
C．A fat male who does not study.
D．A thin male who studies hard.

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