新闻记者要加强哪些修养？为什么？

能引起肥大细胞和嗜碱性粒细胞脱颗粒的因素是（）

A.细胞表面IgE与多价抗原结合

B.C3a、C5a

C.IgE与单价抗原结合

D.植物凝集素与细胞上IgE分子多糖残基结合

E.抗FcεRI抗体

New research shows that overweight or even mildly obese people have a lower risk of early death than people considered to be normal weight.

Researchers examined the results of 97 studies. Most of the studies were less than 10 years old. They included almost three million adults from around the world, including the United States, Canada, China, Taiwan, Brazil, India and Mexico.

The researchers at the National Center for Health Statistics found that people who are considered overweight or slightly obese were five to six percent less likely to die from all causes than people of normal weight. People with higher obesity ratings, however, had almost a 30 percent greater risk of death compared to normal-weight individuals.

Katherine Flegal was the lead author of the study. She says she was not surprised that overweight people would not have a higher risk of death.

“Because we’d actually already read a lot of this literature and realized it was likely that mortality rates (死亡率) for overweight would be at least not higher than normal weight. I guess I was a little bit surprised that it was definitely lower. And I was also surprised that the lower rates of obesity also didn’t seem to differ from normal weight.”

But she says the difference in death rates appears to be small between normal-weight people and those who are overweight or mildly obese.

The study has raised new questions about “body mass index,”（体重指数） or BMI. This is a measurement of body fat as a ratio（比率） of height to weight. In recent years, many public health experts have promoted body mass index as a way to predict the risk of health problems. Bu t a person's BMI can be misleading in some cases.

Steven Heymsfield ,the executive director of the Pennington Biomedical Research Center, says people can be physically fit and in good health, but might weigh more because they are more muscular.

Still, Dr. Heymsfield says people should not think gaining extra weight is OK just because of the new findings. He says being at a healthy weight lowers the risk for heart disease and diabetes（糖尿病）.

小题1:According to the new findings, the researchers found that __________ .

A．People with high obesity have a lower risk of early death than people with low obesity

B．People with overweight have a greater risk of early death than people of normal weight.

C．People with mild obesity are less likely to die than people of normal weight.

D．People with obesity live much longer than people of normal weight.小题2:What does the underlined word “literature” in paragraph 6 mean ?

A．works like novels and poems

B．books and articles on a particular subject

C．printed material

D．magazines and newspapers小题3:Which of the following statements is not true according to the passage?

A．BMI is commonly used to measure body fat as a ratio of height to weight.

B．Not all people with a little higher BMI are fat .

C．Many public health experts encourage more people to use BMI as a way to predict the risk of health problem

D．Because of the ne w findings, people should think about gaining extra weight.

伊斯兰教在形成的过程中，与其他宗教不同的是 [ ]

A、成为统治人民的思想工具

B、有助于国家和民族的统一

C、促成封建制度的形成

D、创造光辉灿烂的文化

为了规范商品房销售管理办法，根据《开发经营条例》的规定，于2001年4月4日颁布了 ( )。

A．《城市房地产管理法》

B．《商品房销售管理办法》

C．《城市商品房预售管理办法》

D．《已购公有住房和经济适用住房上市出售管理暂行办法》

某甲和某工厂订立一份买卖汽车的合同，约定由工厂在6月底将一部行使3万公里的卡车交付给甲，价款3万元，甲交付定金5000元，交车后15日内余款付清。合同还约定，工厂晚交车一天，扣除车款50元，甲晚交款一天，应多交车款50元；一方有其他违约情形，应向对方支付违约金6000元。合同订立后，该卡车因外出运货耽误，未能在6月底以前返回。7月1日，卡车在途经山路时，因遇雨，被块落下的石头砸中，车头受损，工厂对卡进行了修理，于7月10日交付给甲。10天后，甲在运货中发现卡车发动机有毛病，经检查，该发动机经过大修理，遂请求退还卡车，并要求工厂双倍返还定金，支付6000元违约金，赔偿因其不能履行对第三人的运输合同而造成的经营收入损失3000元。另有人向甲提出，甲可以按照《消费者权益保护法》请求双倍赔偿。工厂意识到对自己不利，即提出汽车没有力理过户手续，合同无效，双方只需返还财产。 现请回答下列问题：

甲能否请求工厂支付违约金并双倍返还定金？