单项选择题

A．Increase the sample number.
B．Extend the time of the study.
C．Observe the sample group of vegetarians.
D．Both A and B.
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单项选择题
A．Wasted time.B．Connection costs.C．Lost emails.D．All of the above.
A．Wasted time.
B．Connection costs.
C．Lost emails.
D．All of the above.
单项选择题
A．The location of certain ocean rocks.B．The effect of water pollution on barnacles.C．The medical value of some synthetic products.D．The composition of the barnacle’s glue.
A．The location of certain ocean rocks.
B．The effect of water pollution on barnacles.
C．The medical value of some synthetic products.
D．The composition of the barnacle’s glue.
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