8/9两题怎么写?

Barack Obama is urging to extend a payroll tax cut because it______.

A．is set to expire on December 31

B．raised the unemployment rate

C．created 120, 000 jobs

D．made middle class families benefit

请帮忙给出正确答案和分析，谢谢！

一岁小儿腹泻2天，水样便，每天10多次，伴呕吐4～5次／天，尿量明显减少，眼窝凹陷，皮肤弹性差。血清钠128mmol/L。首先应选用那种液体

A、2/3张含钠液

B、1/3张含钠液

C、1/4张含钠液

D、1/5张含钠液

E、1/2张含钠液

请帮忙给出正确答案和分析，谢谢！

Whats the percent of teenagers who had jobs in 2000？

A．50%.

B．25%.

C．16%.

D．10%.

请帮忙给出正确答案和分析，谢谢！

Where can people buy cheap books in London？

A．In Charing Cross Road.

B．In east End of London.

C．In Farringdon Road.

D．Both in Charing Cross Road and Farringdon Road.

请帮忙给出正确答案和分析，谢谢！

What should you do to have a good memory？

A．Learn effective ways to remember things.

B．Make a conscious effort to practice and exercise.

C．Never stop learning.

D．Never give up trying.

请帮忙给出正确答案和分析，谢谢！