单项选择题

Muscles are unique fibers, because they can ()

A.contract
B.stretch
C.retract
D.do all of the above

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单项选择题
Under a microscope , muscle cells appear to be()

A.textured like wood
B.colored like wood
C.smooth and red
D.short and thick

单项选择题
In what way did the writer find the White family completely different from her own()

A.Her parents were not as loving as the Whites.
B.Hers were very strict parents while the Whites were too kind.
C.When something went wrong the Whites didn' t blame their children for it.
D.When aomething had happened, her parents wanted the children to learn a lesson.

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