Question

【題目】 What color are icebergs (冰山)? White or blue? Surprisingly, there are green icebergs in Antarctica (南極). Their unusual color has confused scientists for years. But scientists have finally solved the mystery of the green icebergs.

Icebergs are large pieces of ice in the sea. Icebergs form after breaking away from glaciers (冰川).

Most icebergs are white. There are also many icebergs in Antarctica that are blue. Glacial ice has a lot of small air bubbles (氣泡). The icebergs appear to be blue because the air bubbles reflect blue light.

However, there are no air bubbles in green icebergs, which means these icebergs are made out of sea ice rather than glacial ice.

But why does sea ice look green? Scientists at the University of Washington, US, recently found the reason--- iron oxide (氧化鐵). It comes from rock dust found on the Antarctic mainland. After studying the green icebergs, scientists found that they have 500 times more iron than glacial ice. The iron comes from bedrock in the ocean. When glaciers grind (碾磨) against bedrock, a powder (粉末) that is rich in iron is created. The powder later mixes with ocean water, which then freezes as green sea ice, Stephen Warren from the university suggested.

This is an important finding because these green icebergs can deliver iron to far parts of the ocean. There, tiny sea plants use the iron as a nutrient (營養(yǎng)物). We thought green icebergs were interesting. But now they may actually be important.

【1】According to the story, icebergs can be ________.

A.white, blue and yellowB.green, blue and yellow

C.white, green and blueD.blue, red and green

【2】Some icebergs look green because ________.

A.there is iron oxide inside of themB.air bubbles inside reflect green light

C.some sea plants are frozen insideD.they are made out of bedrock

【3】The iron in green icebergs comes from ________.

A.glacial iceB.bedrock in the ocean

C.dead bodies of sea animalsD.industrial waste

【4】What can we infer (推斷) from the story?

A.Green icebergs can only be found in Antarctica.

B.Glaciers don’t have any color.

C.Sea ice does not have air bubbles.

D.Antarctica animals feed on colorful icebergs.

【5】What’s the best title of the passage?

A.Iron OxideB.Mystery of the Green Icebergs

C.The Change of ColorsD.Differences between Glacial and Sea Ice

Answer 1

【答案】

【1】C

【2】A

【3】B

【4】C

【5】B

【解析】

本文是一篇說明文。主要講述了美國華盛頓大學的科學家發(fā)現(xiàn)南極洲存在神秘的綠色冰山的原因—冰山里含有氧化鐵。這些氧化鐵來自南極大陸的基巖。

【1】細節(jié)理解題。根據(jù)文中“…there are green icebergs in Antarctica (南極).”，“Most icebergs are white.”，“There are also many icebergs in Antarctica that are blue.”可知冰山有綠色，白色，和藍色。故選C。

【2】細節(jié)理解題。根據(jù)文中“Scientists at the University of Washington, US, recently found the reason—iron oxide (氧化鐵).”可知有一些冰山看起來像綠色是因為里面含有氧化鐵。故選A。

【3】細節(jié)理解題。根據(jù)文中“…The iron comes from bedrock in the ocean.”可知鐵來自海洋中的基巖。故選B。

【4】推理判斷題。根據(jù)文中“Surprisingly, there are green icebergs in Antarctica (南極).”可知在南極有一些綠色冰山，所以選項A錯誤。根據(jù)“... Glacial ice has a lot of small air bubbles (氣泡). The icebergs appear to be blue because the air bubbles reflect blue light.”可知冰山是有顏色的，冰川冰有許多大量的小氣泡，氣泡反射藍光。所以選項B錯誤。根據(jù)“…there are no air bubbles in green icebergs, which means these icebergs are made out of sea ice rather than glacial ice.”可知，綠色冰山中沒有氣泡，這意味著這些冰山是由海冰而不是冰川冰構(gòu)成的。由此推理海冰里沒有氣泡。所以選項C正確。根據(jù)文中“…because these green icebergs can deliver iron to far parts of the ocean. There, tiny sea plants use the iron as a nutrient (營養(yǎng)物).”可知因為這些綠色的冰山可以把鐵輸送到海洋的很遠的地方。在那里，微小的海洋植物利用鐵作為營養(yǎng)物質(zhì)。所以D選項錯誤。故選C。

【5】最佳標題題。根據(jù)文章的主旨句“…there are green icebergs in Antarctica (南極). Their unusual color has confused scientists for years. But scientists have finally solved the mystery of the green icebergs.”可知文章主要解釋了為什么南極洲有些冰山是綠色的。故選B。