【題目】根據(jù)短文內(nèi)容，從短文后的選項(xiàng)中選出能填入空白處的最佳選項(xiàng)。選項(xiàng)中有兩項(xiàng)為多余選項(xiàng)。

Coral reefs

For millions of years, coral reefs have provided homes and food for thousands of different living things. Fish and sea birds share the reef with other sea creatures. Now these beautiful places are in danger. 【1】 Scientists have found that people and pollution have ruined more than one-fourth of the earth’s coral reefs. Unless things change, all of the remaining reefs may die within your lifetime.

Some people think that coral is stone because of its rough, hard surface. But coral is an animal! Tiny polyps (水螅體) form the coral reefs. 【2】 These colours come from the algae (海藻) living inside the coral. Billions of coral polyps stick together. New ones grow on the dead corals. This happens year after year. Over time, the coral builds up a reef. The reef rises from the ocean floor until it almost reaches the sea’s surface. It takes coral 500,000 years to build a huge reef. 【3】

The coral reefs have been harmed in different ways. People have broken off pieces of coral. They wanted to sell or keep them. To catch more fish, people have dropped sticks of dynamite (炸藥) into the water. 【4】 Water pollution has encouraged overgrowth of the sea plants that grow near coral reefs. They block out the sunlight that the algae need. 【5】 Warm water kills the algae. When the algae die, the coral loses both its food and its color. The coral turns white and dies. Scientists call this coral bleaching (珊瑚白化). The bleached part of the coral reef cannot recover.

A. They come in many colours.

B. This has blown up parts of the reefs.

C. So are all the sea plants and animals that depend on them.

D. The worst problem is the heating up of the world’s oceans.

E. Coral reefs are experiencing a rapid increase in most locations.

F. However, it has taken human beings less than 100 years to destroy the reefs.

G. They cover less than 1% of the ocean floor, but support about 25% of sea creatures.

【答案】

【1】C

【2】A

【3】F

【4】B

【5】D

【解析】

試題分析：本文是說(shuō)明文。文章主要介紹了珊瑚礁的形成及人類對(duì)珊瑚礁的破壞。

【1】C由該空前的Fish and sea birds ... these beautiful places are in danger可知，珊瑚礁處于危險(xiǎn)中，依賴珊瑚礁生存的海洋植物和動(dòng)物也處在危險(xiǎn)中，所以答案是C。

【2】A由該空后的These colours come from ...可知，設(shè)空處指“珊瑚色彩斑斕”，所以答案是A。

【3】F 由該空前的It takes coral 500,000 years to build a huge reef以及下一段的描述可知，珊瑚需要花50萬(wàn)年的時(shí)間才能形成巨大的珊瑚礁，而人類用不到100年的時(shí)間就開(kāi)始破壞它，所以但是F。

【4】B由該空前的people have dropped sticks of dynamite into the water可知，這樣會(huì)炸毀部分珊瑚礁，所以答案是B。

【5】D由該空后的Warm water kills the algae可知，最糟糕的問(wèn)題是世界海洋的升溫，所以答案是D。

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