全血黏度降低可见于（） A.子宫出血 B.心肌梗死 C.肺心病 D.高血压病 E.恶

《中华人民共和国合同法》规定，有下列情形( )之一，难以履行债务的，债务人可以将标的物提存。

A．债权人内部发生劳资纠纷

B．债权人下落不明

C．债权人债权积累过多

D．债权人无正当理由拒绝受领

E．债权人死亡未确定继承人

填加新料时，切忌加大用水量，以免降低（），影响产气效果。

根据《货币市场基金信息披露特别规定》，货币市场基金在计算和披露最近7日年化收益率时，会由于( )的不同而有所不同。

A．收益分配时间
B．收益分配频率
C．收益分配规模
D．收益分配水平

Ⅰ型呼吸衰竭（）

A.动脉血氧分压降低

B.动脉血二氧化碳分压升高

C.两者均有

D.两者均无

That rapscallion who leaps off the monkey bars, landing smack onto an innocent 3-year-old bystander, and skips off, giggling all the while According to a new paper out of Israel, he may not feel all that bad about the incident. The study, conducted by Dr. In bal Kivenson Bar-On at the University of Haifa, shows that high levels of fearlessness in 3-and 4-year-olds is ply associated with aggression and a lack of sympathy. This news will likely surprise risk-loving America, where parents typically beam with pride when their undaunted child mounts the big slide.

Fearlessness is a far-end point on the spectrum of what psychologists call the "approach and withdrawal dimension"—people’s tendency to approach new stimuli (to gain information and acquire new skills ) and withdraw from unfamiliar stimuli (to avoid danger). Striking the right balance is considered crucial to man’s survival. But what about preschoolers’ There’s a clear downside, Dr. Kivenson Bar-On discovered, after she observed lots of preschool play and machinations. In total, she documented 80 children at preschool, home and in the lab, measuring their propensity for fearlessness and other social and emotional characteristics at the beginning and end of one year. Fearlessness was measured by observing reactions to various fright-inducing situations: separation from parents, the roar of a vacuum cleaner, a jack-in-the-box and the like. Those who displayed greater levels of fearlessness, the study found, had no trouble recognizing facial expressions of anger, surprise, happiness and sadness in other children—but they had a hard time identifying fear.

Over all, they were "emotionally shallow" and showed lower levels of sympathy. They took advantage of friends and lacked regret over inappropriate conduct. "These findings," the paper explains, " suggest that fearlessness in preschool constitutes a clear risk factor for developmental pathways that lead to problems in morality, conscience development, and severe antisocial behaviors. " At the same time, fearless children tended to be highly sociable. "One of the most interesting findings was that we could discriminate between friendliness and sympathy," Dr. Kivenson Bar-On said. "These kids are curious, easygoing and friendly, but they have a hard time recognizing emotional distress in others. "

Jamie Ostrov, a psychology professor at the State University at Buffalo who studies aggression, says that children at the extreme end of the fearless spectrurn "may be charming, but they’re also highly manipulative and deceptive and skilled at getting their way—even at age 3 or 4. " It could be that fearless children need per distress cues to active their autonomic nervous systems, limiting their ability to detect distress cues in others. It seems to be, if I’m not worried about this, you can’t be, either. But should we be

The example of the first paragraph is to（）

A. quote the research that the children of high levels of fearlessness are lack of empathy

B. illustrate the children ply associated with aggression and a lack of sympathy exist

C. criticize children in reckless behavior and moral deficiency

D. emphasize the necessity of the research