休克病人常出现的酸碱平衡失常为（）。 A.代谢性酸中毒 B.代谢性碱中毒 C.呼吸性

一个三位小数保留两位小数约是0.40，这个三位小数最大是（　　） A．0.490 B．0.399 C．0.404

（6分）物质的用途和使用方法等与其性质密切相关。

（1）铁粉常用于食品的保鲜剂，其原因是________。

（2）生石灰常用作食品干燥剂，用化学方程式表示其原因________。

（3）氢氧化钙常用作建筑材料，因为其吸收二氧化碳会生成坚固的________（写化学式）。

（4）浓硫酸是无色粘稠液体，有吸水性，在化学实验中常用它作干燥剂，但日常生活中却很少用它作除湿剂。原因是__________________________________。

（5）一氧化碳常用来冶炼金属，请用化学反应方程式表示_______________________。

（6）“漂白精”可以快速漂除衣物污渍，其有效成分为次氯酸钠（NaClO），若与“洁厕灵”混用，易产生一种有毒气体。化学方程式为NaClO+2HCl="=NaCl+" X↑+ H₂O ，则X的化学式为________________。

Part 1

Questions 1-8

·Read the article below.
·Choose the best sentence from the list on the next page to fill each of the gaps.
·For each gap (1-8) mark one letter (A-H) on the Answer Sheet.
·Do not mark any letter twice.
Poll: Obama Seen As More Compassionate Than McCain
Just hours before the start of the second presidential debate, a new national survey suggests that Sen. Barack Obama is making gains among Americans as a compassionate candidate. (1)
In a new CNN/Opinion Research Corporation poll out Tuesday afternoon, 55 percent of registered voters questioned say that Obama "cares more about people like you" than Sen. John McCain, with 35 percent saying McCain cares more than Obam

• a. (2)
  "The all-time champion of town-hall debates was Bill Clinton because he was able to connect with the audience members so well," said CNN polling director Keating Holland. "Voters nationwide seem to feel some connection with Obama. (3) John McCain has a pretty good track record at town halls, and it’s possible that he will be the one who looks more compassionate."
  Obama also appears to be building a lead as the candidate with the clearer plan to solve the country’s problems. He has a 15-point lead over McCain on that question in the poll, 48 percent to 33 percent. (4)
  Obama is also making gains on being a p and decisive leader. A 19-point McCain advantage early last month has now shrunk to a 5-point lead. (5)
  "Voters agree with McCain that things are going well for the U.S. in lraq. That’s a switch since April, when we last asked that question," Holland said. (6)
  Among voters, Obama also leads on who would better handle the economy, 57 percent to 37 percent; a financial crisis, 53 percent to 36 percent; and health care, 60 percent to 33 percent. (7)
  Obama’s favorable rating among those questioned in the poll is 62 percent, down one percentage point from three weeks ago. (8) A. But on the question of who has the better experience to be president, McCain still has a big lead over his rival, 54 percent to 36 percent.B. That could be important in the debate in Nashville, which is a town hall-style meeting with the candidates fielding questions from undecided voters in the audience.C. The question is whether he’ll connect with the people at the debate tonight.D. That 20-point margin for Obama is up from a 9-point advantage a month ago.E. McCain’s favorable rating is 54 percent, down three points from three weeks ago.F. "But voters also agree with Obama that the war was a bad idea—and they haven’t changed their minds on that in almost four years."G. McCain leads on the issue of terrorism, 54 percent to 44 percent.H. Last month, McCain had a 2-point advantage over Obama on the topic of having a clearer plan.

世界上第一台电子计算机是何时诞生的？

ACh的降解需要

A．胆碱酯酶
B．单胺氧化酶
C．胆碱乙酰转移酶
D．谷氨酸脱羧酶