试题与答案

一个表由开始,结束,表的内容由、和定义。

题型:判断题

题目:

一个表由开始,结束,表的内容由、和定义。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C

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题型:选择题

读“我国局部地区图”,完成小题。

小题1:图中a山脉两侧山麓分布的自然带分别是(  )

①侧为温带落叶阔叶林带    ②北侧为高山草甸带 

③南侧为亚热带常绿硬叶林带 ④南侧为亚热带常绿阔叶林带

A.②③

B.①④

C.③④

D.②④小题2:a山脉两侧山麓分布的自然带不同,这种变化属于(  )

A.纬度地带分异

B.经度地带分异

C.垂直地带分异

D.地方性分异小题3:关于A、B两条河流的叙述,正确的是(  )

①B河流汛期长 ②A河流汛期长 ③B河流含沙量小 ④A河流含沙量小

A.①②         B.②③     

C.③④         D.①③

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题型:单项选择题

With only about 1000 pandas left in the world, China is desperately trying to clone the animal and save the endangered species. That’s a move similar to what a Texas A & M University researchers have been undertaking for the past five years in a project called "Noah’s Ark".
Noah’s Ark is aimed at collecting eggs, embryos, semen and DNA of endangered animals and storing them in liquid nitrogen. If certain species should become extinct, Dr. Duane Kraemer, a professor in Texas A & M’s College of Veterinary Medicine, says there would be enough of the basic building blocks to reintroduce the species in the future.
It is estimated that as many as 2000 species of mammals, birds reptiles will become extinct in over 100 years. The panda, native only to China, is in danger of becoming extinct in the next 25 years.
This week, Chinese scientists said they grew an embryo by introducing cells from a dead female panda into the egg cells of a Japanese white rabbit. They are now trying to implant the embryo into a host animal.
The entire procedure could take from three to five years to complete.
"The nuclear transfer of one species to another is not easy, and the lack of available (capable of being used) panda eggs could be a major problem, " Kraemer believes. "They will probably have to do several hundred transfers to result in one pregnancy (having a baby). It takes a long time and it’s difficult, but this could be groundbreaking science if it works. They are certainly not putting any live pandas at risk, so it is worth the effort, " adds Kraemer, who is one of the leaders of the Project at Texas A & M, the first-ever attempt at cloning a dog.
"They are trying to do something that’s never been done, and this is very similar to our work in Noah’s Ark. We’re both trying to save animals that face extinction. I certainly appreciate their effort and there’s a lot we can learn from what they are attempting to do. It’s a research that is very much needed. \

According to Professor Kraemer, the major problem in cloning pandas would be the lack of ______.

A. available panda eggs
B. host animals
C. qualified researchers
D. enough money

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