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

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单项选择题

A．voluntary muscles
B．involuntary muscles
C．muscle fibers
D．sensory nerves

单项选择题

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

单项选择题

A．Mrs. White's niece
B．the Whites' cousin
C．Sarah' s friend at college
D．Jane' s friend at school