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【单选题】
下列关于图中所示的四种光学现象，描述或解释正确的是( )A.
图甲中，成像时所成的是倒立的虚像
B.
图，人配戴的凹透镜可以矫正远视眼
C.
图丙中，色散现象说明白光是由各种色光混合而成的
D.
图，漫反射的光线杂乱无章不遵循光的反射定律
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【简答题】阅读理解。 A young woman carrying a three-year-old child got on a bus. The conductor hurried to give her a warm welcome and then kindly asked the other passengers to make more room for the woman and her ch...
【单选题】Heart rate of 2-year-old child is
A.
60~70 times per minute
B.
80~90 times per minute
C.
100~ 120 times per minute
D.
130~140 times per minute
E.
150~160 times per minute
【单选题】The 6-year-old child is old enough_______ himself.
A.
to dress
B.
to wear
C.
dresses
D.
wears
【单选题】Under no circumstances ______ be left alone at home.
A.
a three-year-old child should
B.
should a three-year-old child
C.
a three-year-old child should not
D.
should a three-year-old child not
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