单项选择题

The best Title for the passage may be______.

A．A New Discovery
B．Zinc and Health
C．How Zinc works
D．Acid Zinc to Your Food
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单项选择题
Which of the following statements is NOT true
A．A lack of zinc in the body may slow recovery from a medical operatio.
B．So far no proper way has been found to treat the illness caused by a lack of zinc.
C．Some physical problems turn out to be related to a lack of zinc.
D．A lack of zinc in the body may be compensated by giving zinc sulphate.
单项选择题
Some health experts say food makers should add some elements ______people won't lack these essential substances.
A．since
B．therefore
C．for the purpose that
D．for the effect that
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