国产日韩欧美一区二区三区三州_亚洲少妇熟女av_久久久久亚洲av国产精品_波多野结衣网站一区二区_亚洲欧美色片在线91_国产亚洲精品精品国产优播av_日本一区二区三区波多野结衣 _久久国产av不卡

?

跟蹤導練(一)1

2015-03-16 18:01:44
時代英語·高二 2015年1期
關鍵詞:設想

閱讀地帶

A

There are about 1,200 species of bats in the world, Swartz says. Some eat fruit. Others eat insects or honey. And just a few drink blood.

Some bats use their eyes to see where things are. Others collect information about their surroundings by bouncing sound off objects and listening to the echoes (回聲).

But what all bats have in common (other than being the only flying mammals in existence) are flexible (靈活的) wings that enable them to change directions quickly. If youve ever seen bats flying with a rush through the air in the early evening, you probably noticed how suddenly they could change directions.

Scientists have long assumed (設想) that bats fly the same way as birds and insects do—with firm, airplane-like wings that connect to the shoulder. The problem with that assumption, however, is that bats arent birds or insects. As mammals, they have more in common with people, horses and dogs than with other flying creatures.

For example, birds have bones which are empty inside, and insects have no bones at all. But most mammals have solid and heavy bones, which would make flying tough.

To solve this problem, bats have evolved strong and heavy bones near their shoulders, where they need more support. Theyve also saved some weight by developing lighter and weaker bones near the tips of their wings. The result is light but strong and very flexible wings.

1. What can we know about all bats from the passage?

A. They can hear sounds with their ears.

B. They are the same as birds in every direction.

C. They have nothing in common with people.

D. They can fly well because of their flexible wings.

2. What can be inferred from the passage?

A. Some bats may be dangerous to people.

B. The scientists assumption is proved to be right.

C. Environment helps bats develop the ability of flying.

D. Bats collect information only by listening to echoes.

3. What can be the best title of the passage?

A. Bats B. Bats Food

C. How Bats Fly D. Flexible Wings

B

In Western Europe homelessness has quietly been climbing to levels not seen since the end of World War II. According to the European Federation of National Organizations Working with the Homeless (FEANTSA), at least 3 million Western Europeans are homeless this winter—and between one-fifth and one-third of them are members of homeless families. Think homelessness is an American problem? Think again. As a percentage of population, its as bad in Europe as it is in the US, where there are an estimation (估計) of 2 million homeless people.

猜你喜歡
設想
拓展非接觸式辦稅的基層實踐與設想
對駝峰測長的改進設想
未來幾種探索太空任務設想
太空探索(2015年6期)2015-07-12 12:48:35
和利時:真誠地為用戶設想
自動化博覽(2014年7期)2014-02-28 22:32:33
我設想
航空知識(2009年10期)2009-10-28 07:01:40
消除空襲后果的一些設想
軍事歷史(1981年1期)1981-08-21 03:39:02
涪陵区| 万山特区| 宣恩县| 新疆| 铅山县| 凭祥市| 五河县| 香港 | 花莲市| 滦南县| 化州市| 独山县| 闻喜县| 香格里拉县| 神农架林区| 柏乡县| 长汀县| 龙岩市| 济阳县| 德州市| 新田县| 贺州市| 沾化县| 凌源市| 榆林市| 正阳县| 阳新县| 奉化市| 福泉市| 海安县| 新兴县| 富阳市| 阿瓦提县| 舞阳县| 张家川| 达拉特旗| 鹤壁市| 吉木萨尔县| 阜阳市| 仙居县| 庄河市|