Question

【題目】 Death valley (死亡谷) is famous for its moving rocks. Since the early 1900s, visitors to Racetrack Playa, a dry lake bed in California have wondered how the rocks can move on their own.

These rocks leave long tracks (軌跡) behind them. The long tracks show that the rocks have moved along the ground. Those rocks only move at night and only move once every year or two. And they don’t move at the same time or in the same direction. But how do they move? How can a 350-kilogram rock move? Now scientists have known the key to the question!

Here’s how it happens.

Death Valley is one of the hottest places in the world, but it is cold at night. When it rains, the hard ground becomes soft and wet. When it gets cold enough, the water on the ground will change into very thin ice. Then the strong wind can move flat (平的) rocks along the flat ground In the morning, the sun comes up and dries the ground.

Moving rocks can be found at other places in the world as well, but Death Valley is the most famous.

【1】What interests the visitors most in Death Valley?

A.The mountains around Death valley.B.The scenery of Death Valley.

C.The reason why the lake is dry.D.The secret of the moving rocks.

【2】What shows the rocks can move?

A.The dry lake bed.B.The long tracks behind them.

C.The weight of the rocks.D.The shapes of the rocks.

【3】How is the weather in Death Valley?

A.Hot in the day and wet at night.B.Cool in the day and dry at night.

C.Hot in the day and cold at night.D.Cold in the day and windy at night.

【4】What can carry the rocks over the lake bed?

A.The wind.B.The heat.C.The rain.D.The visitors.

【5】What’s the best title for this passage?

A.Dry Lake BedB.Soft and Wet Ground

C.Tracks of RocksD.Moving Rocks in Death Valley

Answer 1

【答案】

【1】D

【2】B

【3】C

【4】A

【5】D

【解析】

本文是一篇說明文。介紹了發(fā)生在死亡谷中的一個奇怪現(xiàn)象——石頭會自己移動。文章通過分析死亡谷的地理特點，解開了“移動的石頭”之謎。

【1】細(xì)節(jié)理解題。根據(jù)短文第一段第二句“…a dry lake bed in California have wondered how the rocks can move on their own.”可知，死亡谷中會移動的石頭最能吸引游客的興趣。故選D。

【2】細(xì)節(jié)理解題。根據(jù)短文第二段第二句“The long tracks show that the rocks have moved along the ground.”可知，石頭后面留下的長長的軌跡證明了石頭在移動。故選B。

【3】細(xì)節(jié)理解題。根據(jù)第四段第一句“Death Valley is one of the hottest places in the world, but it is cold at night.”可知，在死亡谷中，白天炎熱，夜間寒冷。故選C。

【4】細(xì)節(jié)理解題。根據(jù)第四段第四句“Then the strong wind can move flat (平的) rocks along the flat ground.”可知，大風(fēng)會吹著死亡谷中的石頭移動。故選A。

【5】主旨大意題。文章以會移動的石頭為核心尋找這一秘密的答案，通過分析死亡谷的地理特點，破解了人們多年的謎團(tuán)。故選D。