通过实施《煤炭质量管理制度》，可以（） A.稳定提高煤炭质量，明确煤炭产品验收标准，

如图所示是物体在某段运动过程中的v－t图象，在t₁和t₂时刻的瞬时速度分别为v₁和v₂，则时间由t₁到t₂的过程中 （     ）

A．加速度不断增大

B．加速度不断减小

C．平均速度v＝

D．平均速度v<

春三月，此谓______。夏三月，此谓______。

男，50岁，30年吸烟史，支气管镜活检病理可见鳞状上皮和支气管腺体，此种病理变化属于

A．支气管黏膜化生
B．支气管黏膜肥大
C．支气管黏膜萎缩
D．支气管鳞状细胞癌
E．支气管腺癌

张某和郭某在赵某开的的工厂打工，赵某拖欠张、郭6000多元的报酬一直不付。张、郭二人商定后，将赵某15岁的女儿A骗出，然后带到外地扣押以迫使赵某支付报酬；在此期间(共21天)，张、郭多次打电话让赵某支付报酬，但赵某仍然以各种理由拒不支付。于是，张、郭商定将A卖给他人。在张某外出寻找买主期间，郭某 * * 淫了A。张某找到了买主陈某后，张、郭二人以6000元将A卖给了陈某。陈某买回A后，要与A结为夫妻，遭到A的拒绝；陈某担心A逃走，便将A关在房间里反锁了1个多月，A仍不愿意与陈某结婚；陈某后来觉得A年纪小、太可怜，便让A回原居住地与家人团聚。陈某又觉得自己亏了，于是找到了张某，让张某退回自己的6000元钱。张某拒绝退还，陈某便于深夜将张某的一辆价值4000元的摩托车骑走。 根据上述案情，分析张某、郭某、陈某的刑事责任。

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