下列人身保险中，适用损失补偿原则的是（）。A．意外伤害保险中的残疾给付 B．两全保险

用线将下列词语恰当地搭配起来。

缓缓地    跟着

静静地    前进

悄悄地    站着

紧紧地    哭着

1960年尼克松曾说：“一个国家必须爱好和平才具备进入联合国的资格。十分明显，中国不是。”1971年又说：“没有中华人民共和国的参加，是不能有稳定与持久的和平的。”尼克松前后两种说法本质一致的地方是[ ]

A．美国始终坚持采取遏制和孤立中国的政策

B．美国始终不承认中国在联合国的合法席位

C．美国始终以自身利益得失作为处理国际关系的出发点

D．美国认为中国在国际关系中具有举足轻重的地位

Some fish form huge schools. Could fish set up schools and teach their children how to survive in the ocean? You may ask. No. Here the “schools” are not the places where you study. They are fish shoals (鱼群) that cover tens of kilometers. What causes hundreds of millions of fish to gather and move together is one of biology’s mysteries.

Darkness appears to be the first step to the creation of shoals, according to a study published in the March 27 journal Science. A team of researchers from the Massachusetts Institute of Technology (MIT) and five other institutions studied Atlantic herring (鲱鱼), which forms shoals on a fishing ground off Massachusetts. They used an underwater imaging technology and fish-finding sonar (声纳) to observe the herring over several days in autumn when they spawn (产卵).

They found that, as the sun set, fish in scattered (分散的) groups began swimming much closer to one another than they normally do. When the number of fish reached a certain point in an area, this set off a chain reaction of similar behavior that spread like a sound wave through the water.

The herring’s movement seemed to be started by sunset. The team didn’t record the breakup of these shoals, but a previous study suggested that as the sun rose, the shoals fell apart.

“When the light fades (逐渐消失), it’s safer for the fish to move away from the seabed,” says Nicholas Makris, a professor at MIT who led the research. “Once they have a certain number of other fish, they suddenly come together - forming a shoal covering tens of kilometers within tens of minutes.”

Herring form shoals to migrate during the autumn spawning season. Some shoals were 40 km across and 30 m from top to bottom. They formed in deep water and moved into more shallow waters to spawn.

Forming shoals helps protect them from predators (掠食者) by giving them simple strength in numbers. The ordered movement of the shoal means the fish can reach their spawning ground more quickly and more safely.

Scientists have never before gathered information on so many animals acting together. Understanding these herring shoals could lead to more ideas about what causes animals to move in schools, says Iain Couzin, a biologist at Princeton University, US.

1. Which school in the following expressions is used the same way as the underlined one in the first paragraph?

A. schools of thoughts       B. school a horse   C. a school of whales       D. a medical school

2. Which of the following statements is true?

A. There are more large shoals of herring at night than in the daytime.

B. The research on Atlantic herring was conducted independently by the Massachusetts Institute of Technology.

C. The larger the shoal of herring is, the more slowly it moves.

D. Scientists have found out the reason why fish gather and move together in huge shoals.

3. According to the research, herring tend to get together except ______.

A.when there are predators around  B. when they spawn C. when the sun sets  D. when the sun rises

4. What seems to be the main reason for herring to gather and move together?

A. To avoid the darkness.

B. To keep other kinds of fish out of their spawning ground.

C. To spawn in the shallow waters.

D. To make themselves feel safe.

参加国际展览的入境展览物品及其包装材料、运输工具均应实施检验检疫。 ( )

在Word2000下，选定矩形文本块一般是通过鼠标拖放与（）键配合操作

A.Alt

B.Shift

C.Ctrl

D.Numlock