-1≤1/x+2≤4 解不等式原题是：若f(x)的定义域为[-1,4],求f(1/2+2)的定义域。

What did the woman get？

A．A letter.

B．A telephone call.

C．A contract.

D．A copy of the agenda.

请帮忙给出正确答案和分析，谢谢！

What does the woman tell the man at the beginning of the conversation？

A．The working environment in her office.

B．Her feeling about working with Harry.

C．The trouble Harry has met.

D．The mistakes she has made.

请帮忙给出正确答案和分析，谢谢！

How do the new federal guidelines deal with breakfast？

A．They suggest a small snack to replace it.

B．They cap it at 450 to 600 calories.

C．They prefer an empty stomach to it.

D．They pay more attention to lunch than to it.

请帮忙给出正确答案和分析，谢谢！

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

A．the lack of protein and vitamins

B．the insufficiency of lunch supplies

C．the amount of after-school activities

D．the ignorance and omission of breakfast

请帮忙给出正确答案和分析，谢谢！

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！