胎盘的功能有（） A.防御功能 B.合成功能 C.供给营养 D.气体交换

下列叙述与彩色多普勒血流显像仪性能无关的是（）。

A.空间分辨力，速度分辨力，动态分辨力

B.微小血管低速血流检测的灵敏度

C.图像及血流彩色均匀性

D.血管内彩色血流的充盈度

E.彩色标图的形状

气象条件及其变化不仅影响人的生理健康，对心理情绪的影响也非常明显。有利的气象条件使人情绪高涨、心情舒畅；不利的气象条件使人情绪低落、懒惰无力，甚至导致心理及精神病态和行为异常。研究表明，高温、高湿、阴雨以及一些异常天气事件，都不利于人的心理健康。世卫组织的一份资料表明，上世纪的厄尔尼诺现象使全球约10万人患上抑郁症，精神病发病率上升8%。究其原因，是该现象引起全球范围的气候异常和天气灾难，超过部分人的心理承受能力，导致其出现坐卧不安、思维迟钝等精神异常状况。 这段文字意在说明：

A.异常天气会对人的精神状况产生不利影响 

B.抑郁症与气候异常、天气灾难有一定关系 

C.有必要深入研究厄尔尼诺等异常气象条件 

D.古代“天人合一”的说法有一定的科学道理

甲、乙两工程队合修一条长1400米的公路，他们从两端同时开工，甲队每天修80米，乙队每天修60米．修完这条公路，甲、乙两队各修了多少米？

下列各句中，没有语病的一句是(    )

A．中国消费者协会的药品说明书评论报告显示：在随机抽取的83份药品说明书中，有36份存有“只说不明”，“缺斤少两”的问题。

B．最近两年，互联网市场上一批免费上网的服务公司应运而生，它们吸收了众多的用户，向市场推出了更加优惠的服务方式。

C．在世界杯外围赛前的热身赛中，米卢执教的中国队连遭败绩，这一结果大大超出中国球迷的意料之外。

D．日前，天津市两学生玩“蹦极”摔裂颅骨，事故发生的原因和设备的质量问题正在调查之中。

With U.S. companies sitting on an estimated $1.8 trillion in cash, it raises the question: Why aren’t they deploying more of their hoard to expand their businesses Or one might channel John Maynard Keynes to ask: Where have the "animal spirits" gone Although capital spending in the U.S. is up 12 percent since the lows of early 2009, it’s still running $88 billion below the peak of $1.34 trillion reached in the first quarter of 2008, says Joseph LaVorgna, chief U.S. economist at Deutsche Bank. He doesn’t expect capital spending to catch up to that peak level and officially start to expand until the second quarter of 2011. (LaVorgna’s definition of capital spending includes physical equipment and software, but not structures such as new stores or manufacturing plants. Spending on structures is about 2 percent of gross domestic product, one-third the size of capital sending’s contribution to GDP, he says.)

"The trend and momentum have definitely turned and it’s just a matter of time before you see other companies give way to capital spending, and eventually that will result in hiring," says LaVorgna. But with spending running $88 billion below peak, he says employment "should be farther along than it is." Companies that have built up a lot of cash are starting to take some chances such as expanding into new markets, which requires hiring new workers, says John Challenger, chief executive officer of Challenger, Gray & Christmas, an employment consulting firm. U.S. companies have announced the hiring of 118,209 new employees through August, according to data collected by the firm.

So who’s stepping up to the plate Some companies refuse to be cowed and are taking big, if calculated, chances, including ambitious capital projects, hiring new workers, and expanded investment in research and development, according to growth-oriented mutual fund managers contacted by Businessweek.com. If there’s a common denominator, it’s a perceived opportunity and confidence in sustainable demand, whether due to new trends in technology or to new markets that need certain products. Other names came from a list of the top-hiring U.S. companies through July 2010 compiled by Challenger, Gray & Christmas.

"We don’t spend capital unless we have a new contract to supply oxygen, nitrogen, or hydrogen to our customers," says James Sawyer, Praxair’s chief financial officer. "Those are 15-year contracts with minimal take-or-pay clauses written into them, which ensure we will get a good return on our capital investment, regardless of how the rest of the economy is doing."

Some younger outfits with entrepreneurial managers who have lived through a few business cycles think their companies may be able to steal a march on competitors more reluctant to spend, says Aram Green, manager of Clear Bridge Advisors Small Cap Growth Fund. "There’s clearly been a decision by management that ’This is not the time to take our foot off the accelerator. In fact, it’s time to push harder and further distance our product from the competition.’\

Which of the following could best summarize the passage ？（）

A.Capital spending will result in hiring.

B.New stores or manufacturing plants come up.

C.How can companies benefit from capital spending.

D.Companies give way to capital spending.