According to the first paragraph, what are many American parents worried about?
A.The potential physical problems of the kids.
B.The higher standard set by the federal government.
C.A study coming out every other week.
D.Their children's emotional or behavioral problems.
第3题
A.情报活动、设计活动、抉择活动、审查活动
B. 情报活动、设计活动、抉择活动
C. 设计活动、抉择活动、审查活动
D. 情报活动、设计活动、审查活动
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