According to Mohning, high school students midday hunger is mainly due to______.A．the lack

某单位采用新旧两种测定方法进行尿铅测定，欲比较两法测得的结果有无差别，宜用

A.两小样本均数比较的t检验

B.两大样本均数比较的μ检验

C.配对计量资料比较的t检验

D.两个几何均数比较的t检验

E.t′检验

请帮忙给出正确答案和分析，谢谢！

It can be inferred from the passage that______.

A．all Type D"s have more or less heart problems

B．Type D"s tend to seek more medical care

C．Type D"s prone to hide their personal emotions

D．it"s helpful for Type D"s to keep distance with others

请帮忙给出正确答案和分析，谢谢！

What does stress mean to Type Ds？

A．An outlet for their feelings.

B．More exercise and less smoking.

C．A cause of high blood pressure.

D．More discussions with their doctors.

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婚前保健服务应包括婚前的

A、卫生指导，健康咨询，医学检查

B、卫生指导，卫生咨询，医学检查

C、遗传指导，卫生咨询，医学检查

D、卫生指导，卫生咨询，遗传检查

E、卫生指导，健康咨询，遗传检查

请帮忙给出正确答案和分析，谢谢！

学龄期儿童处于生长发育阶段，为此，中国营养学会关于学龄儿童的膳食指南中特别强调了此期儿童在饮食方面的一些特殊要求，但并不包括

A、保证吃好早餐

B、重视户外活动

C、饮用碳酸饮料

D、控制食糖摄入

E、少吃零食

请帮忙给出正确答案和分析，谢谢！

In last year, Brazils economic growth was______.

A．2%

B．2.7%

C．5.5%

D．7.5%

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What does the man say about Harry？

A．He is too negative.

B．He is smart and enthusiastic.

C．He has got his own strengths.

D．He spends project money too fast.

请帮忙给出正确答案和分析，谢谢！