如图所示，弹簧将小球弹起，说明力的作用效果是______________；小球离

正是因为有了第二味觉，哺乳动物才能够边吃边呼吸。很明显，边吃边呼吸对保持哺乳动物高效率的新陈代谢是必要的。
以下哪种哺乳动物的发现，最能削弱以上的断言

A．有高效率的新陈代谢和边吃边呼吸的能力的哺乳动物。

B．有低效率的新陈代谢和边吃边呼吸的能力的哺乳动物。

C．有低效率的新陈代谢但没有边吃边呼吸能力的哺乳动物。

D．有高效率的新陈代谢但没有第二味觉的哺乳动物。

个体心理发展的首个加速期是（）。

A.婴幼儿

B.童年期

C.少年期

D.青年期

Britain’s seed(种子) bank, the only one in the world aiming to collect all of the planet’s wild plant species, has reached its goal of banking 10 percent by 2010.

The Millennium Seed Bank Project, run by Kew Gardens—one of the oldest botanical(植物的)  gardens—will officially place the 24,200th species on Thursday, a pink, wild banana from China.

More than 50 countries are now on board with Kew's giant task but vast places of the globe, including India and Brazil, still need to join in and donate seeds, director Paul Smith said.                                                                                                                                                            

The seed bank is one of the largest and most diverse(多样的) in the world with more than 1.5 billion seeds. Its goal is to help protect the planet’s bio-diversity during a time of climate change.

The wild banana seed is under threat of extinction(灭绝) in southwest China from agricultural development. It is a vital food source for Asian elephants and important for growing bananas for human eating.

Stored at minus-20 degrees centigrade, so they can last for thousands of years, the seeds await the day that scientists hope never comes—when the species no longer exist in the wild.

It is a race against time, Smith said, because in the last ten years alone, 20 plants held in the bank have already been wiped out in the wild. He estimates that between a third and a quarter will become extinct this century.

"It is pressing and it is happening now. An area, the size of England, is cleared of primary vegetation（植被）every year." Smith said.

Because most of the world's food and medicines come from nature, protecting wild plant species is quite important, scientists say. There are already many other seed banks safeguarding food crops, which only account for 0.6 percent of plant diversity.

For Kew's next goal—to collect a quarter of wild varieties（种类）by 2020—the botanists need 10 million pounds a year, or a further 100 million pounds on top of the 40 million they have already been granted.

小题1:What’s the final purpose of the Britain’s seed bank?

A．To collect enough money for the project.

B．To safeguard food crops.

C．To protect wild plants from extinction.

D．To help scientists study wild plants.小题2:We can learn from the passage that _______.

A．the seeds in the bank can be used now and then all over the world

B．India and Brazil haven’t joined in the Seed Bank Project at present

C．there is only one seed bank in the world at present

D．the wild plants in places like India and China will never die out小题3:What does the underlined word “it” in paragraph 7 refer to?

A．The extinction of plant species.

B．The Millennium Seed Bank Project.

C．Britain’s seed bank.

D．Kew Gardens’ next goal.小题4:Which of the following isn’t spoken about in the passage?

A．The global partnership of collecting wild plant species.

B．The temperature condition of the wild plant species in the bank.

C．The government’s support for the seed bank project by giving money.

D．Scientists’ concern on the extinct wild plant species.

（）是保证幼儿各方面健康发展的前提。

A.幼儿适应环境和抗疾病的能力

B.良好的生活习惯

C.参加体育活动的兴趣

D.促进幼儿身体正常发育

对于数据库的描述错误的是（）。

A、数据库避免了一切数据的重复

B、若系统是完全可以控制的，则系统可确保更新时的一致性

C、数据库中的数据可以共享

D、数据库减少了数据冗余