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生物因素是指一定的地域内影响某种生物         的        。在湿地生态系统中，影响鱼的生物因素有（任意举3例）       、         、          。

答案

生活、其他生物 、略

环境中影响生物生活的各种因素称为环境因素，可以分为非生物因素和生物因素．非生物因素包括：光、温度、水、空气等．生物因素是指环境中影响某种生物个体生活的其他所有生物，包括同种和不同种的生物个体．在湿地生态系统中，影响鱼的生物因素有水草、虾、螺等

故答案为：生活；其他生物；水草；虾；螺

选择题

读图回答

小题1:有关图中四地天气状况的正确叙述是（   ）

A．甲地风向为西南风

B．乙地气温较高

C．丙地风速最大

D．丁地气压最低小题2:关于戊地天气系统的正确组合为（   ）

①南半球②北半球③暖锋④冷锋

A．②③

B．②③

C．①④

D．②④
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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. \

The best title for the passage may be ______.

A. China’s Success in Pandas Cloning
B. The First Cloned Panda in the World
C. Exploring the Possibility to Clone Pandas
D. China—the Native Place of Pandas Forever
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