单项选择题

Taking a lot of VC ______.

A．is supported by VC experts
B．is encouraged by the US government
C．is agreed by medical researchers
D．is disapproved by many scientists
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单项选择题
Which of the following statements is implied but not stated
A．Pebbles tossed into the air make no sound that can be heard by human ears.
B．A bat will catch hundreds of moths in a single hour.
C．Insect-eating bats are totally blind.
D．The sonar system of bats is as good as man-made sonar.
单项选择题
Which one is NOT TRUE about the effect of VC according to the passage
A．It is important for human health.
B．It may help produce substances that can damage DNA.
C．It causes cancer.
D．VC in foods can reduce the chance of developing heart disease and cancer.
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