问题 填空题

生物圈包括大气圈的底部、水圈的大部和岩石圈的表面,其中,______是人类的“立足点”.

答案

生物圈是地球上的所有生物与其生存的环境形成的一个统一整体,生物圈的范围:以海平面为标准来划分,生物圈向上可到达约10千米的高度,向下可深入10千米左右深处,厚度为20千米左右的圈层,包括大气圈的底部、水圈的大部和岩石圈的表面;大气圈中的生物主要集中于下层,即与岩石圈的交界处.鸟类能高飞数千米,昆虫以及一些小动物可被气流带至高空,甚至在22000米的平流层中还发现有细菌和真菌.限制生物向高空分布的主要因素有缺氧、缺水、低温和低气压.大气圈中的生物主要有昆虫、鸟类、翼手类、漂浮在空中的细菌等微生物;岩石圈是地球表面的固体部分.它的表面大多覆盖着土壤,是一切陆生生物的“立足点”.在这一圈层内,有郁郁葱葱的森林,一望无际的草原,绚丽多彩的奇花异草,还有五颜六色的昆虫,种类繁多的飞禽走兽,以及大量的细菌、真菌.岩石圈也是人类的“立足点”.在岩石圈中,生物分布的最深记录是生存在地下2500~3000米处石油中的石油细菌,但大多数生物生存于土壤上层几十厘米之内.限制生物向土壤深处分布的主要因素有缺氧和缺光;水圈的大部主要指的是海平面150米以内,150米以下无光,不适合生物的生存,但也有少量的生物.

故答案为:岩石圈的表面

阅读理解

A small town in southwest Britain is banning(禁止) plastic bags in an attempt to help the environment and cut waste—a step that environmentalists believe is a first for Europe.

Shopkeepers in Modbury population 1500,agreed to stop handing out disposable plastic bags to customers on Saturday.They said paper sacks and cloth carrier bags would be offered instead.

Last month,San Franciso became the first U.S. city to ban plastic grocery bags.Internationally,laws to discourage the use of plastic bags have been passed in parts of South Africa and Ireland,where governments either tax shoppers who use them or fine companies that hand them out.Bangladesh already bans them,and so do at least 30 remote Alaskan villages.

Modbury,about 225 miles southwest of London,has also declared a bag amnesty(宽限期),allowing local people to hand in plastic bags that have piled up at home.They will be sent for traveling.

The Modbury ban was the idea of Rebecca Hosking,who saw the effect of bags on marine life while working in the Pacific as a wildlife camerawoman.She said response(反应) in the town so far had been “really positive”.

“Modbury is quite an old-fashioned town and a lot of people have wicker baskets to go out shopping anyway,”Hosking told Sky News Television.

The Worldwatch Institute,an environmental research agency,states that 100 billion plastic bags are thrown away each year in the United States alone.More than 500 billion are used yearly around the world.

小题1:What was Rebecca Hosking?

A.A lawyer.

B.An environmentalist.

C.A sailor.

D.A photographer.小题2:The underlined word “disposable” in the passage probably means _______.

A.acceptable

B.valuable

C.throw-away

D.long-lasting小题3:It can be inferred from the passage that _______.

A.most of the people in Modbury continue to use plastic bags

B.fewer and fewer plastic bags will be used in the world

C.San Francisco is the first city to ban plastic bags in the world

D.most countries in the world have passed laws to ban plastic bags小题4:Which of the following would be the best title of the passage?

A.Environmental Protection

B.Big Cities Banning Plastic Bags

C.Effect of Plastic Bags on Sea Animals

D.British Town Banning Plastic Bags

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