某工厂用CaSO4、H2O、NH3、CO2制备(NH4)2SO4。其工艺流程如下

C₃增高可见于（）

A.肿瘤

B.活动性SLE

C.急性炎症

D.传染病早期

E.类风湿性关节炎

已知方程x²+px+q=0的两根均为正整数，且p+q=28，那么这个方程两根为______．

Trying to make a big decision while you’re also preparing for a scary presentation? You might want to hold off on that. Feeling stressed changes how people weigh risk and reward. However, an article published in Current Directions in Psychological Science, a journal of the Association for Psychological Science, suggests stressed people pay more attention to the positive sides of a possible outcome.

It’s a bit surprising that stress makes people focus on the way things could go right, says Mara Mather of the University of Southern California. She co-wrote the review paper with Nichole R.Lighthall. “This is sort of not what people would think, ” Mather says. “Stress is usually associated with negative experiences, so you’d think, maybe I’m going to be more focused on the negative outcomes.”

But researchers have found that when people are under stress, they start paying more attention to positive information and discounting negative information. “Stress seems to help people learn from positive feedback and impairs（削弱）their learning from negative feedback, ” Mather says.

When people under stress are making a difficult decision, they may pay more attention to the good sides of the alternatives they’re considering and less to the problems. So someone who’s deciding whether to take a new job and is feeling stressed by the decision might focus on the increase in salary more than the longer commute（上下班往返）.

The increased focus on the positives also helps explain why stress plays a role in addictions. People under stress have a harder time controlling their urges. “The compulsion to get that reward comes stronger and they’re less able to resist it,” Mather says. A person who’s under stress might think only about the good feelings they’ll get from a drug, while the downsides shrink into the distance.

Stress also increases the differences in how men and women think about risk. When men are under stress, they become even more willing to take risks; when women are stressed, they get more conservative(保守的). Previous research backs this up — men usually react to difficulties while trying to fight them or escape them; women try to find friends and improve their relationships.

小题1:By saying “You might want to hold off on that” in the first paragraph, the writer suggests that      .

A．you might want to delay making your big decision

B．you should save the presentation for later

C．you should avoid taking risks

D．you might benefit from the stress小题2:From the article, we can conclude that stress       .

A．often leads people to take more risks

B．often leads people to make balanced decisions

C．makes people think more of negative results

D．makes people ignore the negative side of problems小题3:Which of the following is TRUE according to the article?

A．Stress is helpful in getting rid of addictions.

B．People who are addicted to drugs are easily stressed.

C．When women are stressed, they do not tend to take risks.

D．When men are stressed, they are more likely to develop an addiction.小题4:What is the central theme of the article?

A．Stress can affect decision-making.

B．Stress increases our desire to get rewards.

C．We should think more about the upside of problems.

D．There is a link between stress and negative experiences.

下列选项中，不能用作标识符的是

A．_1234_

B．_1_2

C．int_2_

D．2_int_

一67岁女性糖尿病患者因股骨颈头下型骨折行人工股骨头置换术治疗，是因为（）

A.对老年股骨颈头下型骨折患者，人工股骨头置换术是最好的选择

B.对老年股骨颈头下型骨折患者，不能做全髋置换

C.一般情况下，人工股骨头置换手术时间比全髋置换短，对患者打击轻，更安全

D.人工股骨头比全髋价格低

E.错误选择，应做全髋置换