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学好化学用好化学知识，可以有效提高我们的生活质量，下列有关说法正确的是（ ） A．食品添加剂对人体健康危害 B．人的营养素包括蛋白质、糖类、油脂、维生素和钙铁锌等微量元素 C．香烟的烟气中含有一氧化碳、尼古丁等数百种有毒物质 D．“白色污染”主要指白色垃圾造成的污染
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举一反三
【单选题】Ancient cave art and more recent paintings and sculpture illustrate only people's fear about bears.
A.
Y
B.
N
C.
NG
【单选题】Who said 'The only thing we have to fear is fear itself'?
A.
Abraham Lincoln.
B.
Winston Churchill.
C.
John F. Kennedy.
D.
Franklin D.Roosevelt.
【简答题】Franklin Roosevelt told the Americans that the only thing we have to fear is ________.
【单选题】The most destructive element in the human mind is fear．Only when we are no longer afraid _______ to live．
A.
we are beginning
B.
begin we
C.
we begin
D.
do we begin
【简答题】The child seemed to have a(n) ______ (normal)fear of strangers.
【单选题】Fear becomes a problem only when ______ .
A.
the danger is thought greater than it really is
B.
eth danger is ore psychological than physical
C.
one cannot stand the danger
D.
one is not well prepared for it
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