计算机内部采用的数制是______。A．十进制 B．二进制 C．八进制 D．十六进制

When an animal helps another animal, it usually gets something valuable in return. For a long time, many scientists thought that only people could act generously just because it feels good.

However, a new study in Germany suggests that chimpanzees (黑猩猩)also do good things for no real reason. And so do children who are as young as 18 months of age. Maybe it is because humans and chimpanzees share an ancestor(祖先) about 6 million years ago.

People and chimpanzees appear to develop such features(特征) without any other training, says Warneken, a scientist in Germany. Warneken and his partners worked on adult chimpanzees that live on an island in the African country of Uganda. They also worked with 18-month-old children in Germany. The researchers performed three experiments on the adult chimpanzees and two experiments on the kids. In the first animal experiment，a person tried to reach his arm into a cage to get a stick，but he couldn’t reach it. A chimpanzee was in the cage，and it could reach the stick if it wanted to.

Thirty-six chimpanzees took part in this experiment one by one, and no chimpanzee saw what the other chimpanzees had done. Even though the animals hadn’t met the person before, they usually took the stick and gave it to the person. What’s more, they did this whether or not the person offered them bananas as a reward. In a similar experiment, 36 children acted in a similar way. They helped the person reach the stick, whether or not they were offered toys for their help.

Researchers did other experiments on chimpanzees and babies. No rewards were offered in either experiment. And still, both the chimpanzees and children went out of their way to help. Still, the new study is different from earlier findings. Researchers have found that chimpanzees don’t give rewards of food to other chimpanzees, even if it costs them nothing to be generous.

小题1:Warneken and his partners worked with ________.

A．young chimpanzee that live on an island

B．18-month-old children who live in Germany

C．kids who are living with adult chimpanzees

D．adult chimpanzees that live on the African mountain小题2:A new study in Germany suggests that ________.

A．people also share information for good reason

B．children know something at the age of 18 months

C．chimpanzees do good things for no real reason, too

D．humans should develop their abilities 6 million years ago小题3: Which of the following is NOT true according to the passage？

A．Thirty-six chimpanzees joined in this experiment one by one

B．No chimpanzee saw what the other chimpanzees had done

C．The animals hadn’t met the person before the experiments

D．Chimpanzee gave the person the stick in order to get a reward小题4:From the passage we know that ________.

A．both chimpanzees and children can find their way to help others

B．chimpanzees will reward good food to other chimpanzees

C．children is more generous than chimpanzees in some ways

D．both chimpanzees and children can do the difficult experiments

2010年11月24日，国家统计局发布了11月中旬50个城市主要食品平均价格变动情况。畜禽肉类价格维持升势。其中猪肉价格涨速明显加快，后腿肉和五花肉价格分别较上期上涨3.2%和4.2010。羊肉以及鸡鸭肉上涨逾1%，牛肉价格微升0.5010，鸡蛋价格继续上涨2.lqo。试想如果一个国家发生了通货膨胀，且假定人民的收入水平不变，那么这个国家的恩格尔系数会[ ]

A．持续上升

B．持续下降

C．变动不大

D．可能上升，也可能下降

可用于嗜铬细胞瘤所致室性心律失常

A．利多卡因
B．奎尼丁
C．普罗帕酮
D．普萘洛尔
E．胺碘酮

经厂本

艾滋病防治工作的具体办法由哪一部门制定

A．国务院
B．国家卫生部
C．省级人民政府
D．省级卫生行政部门
E．军队卫生主管部门