Question

【題目】 How much do you know about Earth—the planet that we live on? Our knowledge of Earth has been developing since ancient times. However, many puzzles (謎) about Earth remain unsolved. Live Science has published a list of the eight biggest mysteries about Earth. Let’s look at some of them.

Where did water come from?

When it first came into being 4.5 billion years ago, Earth was a dry rock. So where did all of our water come from? Scientists think that it might have arrived in the form of ice by an asteroid (小行星) from outer space that hit our planet. But this idea has not been confirmed (證明) because there is very little related evidence(相關證據) to be studied.

What’s in the core (地核)?

Scientists used to study meteorites (隕石) as small examples of Earth, believing that Earth’s core was made of iron and nickel (鎳). However, a later study in the 1950s proved this way to be wrong because it found that Earth would be too light to provide gravity (引力) if its core contained only iron and nickel. Today, scientists continue to bring forward different ideas, but none have been confirmed.

How was the moon born?

Scientists have found that the chemical compositions (成分) of Earth and the Moon are very similar. That suggests that the Moon actually came from Earth. For example, it could be a piece of Earth that separated when Earth hit another planet. It is also possible that when Earth first came into being, it spun (旋轉) very fast and threw off enough molten (熔化的) rock to later form the Moon.

【1】What’s the main idea of the passage?

A.How Earth came into being.

B.Where Earth’s water came from?

C.How the moon was formed?

D.Unexplained mysteries about Earth.

【2】What do we know about where water may come from?

A.Earth’s water may come from ice that melted 4.5 billion years ago.

B.Earth’s water may come from a small planet that hit Earth.

C.We don’t know where water came from.

D.There is lots of evidence that tells us where water came from.

【3】What does the underlined phrase “bring forward” in Paragraph 5 probably mean?

A.CheckB.Raise

C.ImproveD.Receive

【4】Which of the following is TRUE according to the passage?

A.Scientists used to believe Earth’s core was made of meteorites.

B.A study in the 1950s proved that Earth’s core is made of iron and nickel.

C.The moon and Earth are made of similar materials.

D.Three possibilities of where the Moon came from are mentioned.

Answer 1

【答案】

【1】D

【2】B

【3】B

【4】C

【解析】

本文是一篇說明文，文章主要講述了有關地球的幾個謎團：1.地球的水是怎么來的？2.地核里有什么？3.月球是如何誕生的？針對這幾個謎團，作者進行了簡單的闡述。

【1】主旨大意題。根據第一段“Live Science has published a list of the eight biggest mysteries about Earth. Let’s look at some of them.”可知本文主要講述了有關地球的未解之謎。故選D。

【2】細節(jié)理解題。根據“Scientists think that it might have arrived in the form of ice by an asteroid (小行星) from outer space that hit our planet.”可知地球上的水可能來自撞擊地球的一顆小行星。故選B。

【3】詞義猜測題。check檢查； raise提出； improve改善； receive接收；根據“Scientists …believing that Earth’s core was made of iron and nickel (鎳).”和“Today, scientists continue to bring forward different ideas”可知科學家已經提出過有關地核里是什么的觀點，但是被否認了，如今科學家繼續(xù)提出不同的觀點，故bring forward意為提出，與raise同義。故選B。

【4】細節(jié)理解題。根據“Scientists used to study meteorites (隕石) as small examples of Earth, believing that Earth’s core was made of iron and nickel (鎳).”可知A選項錯誤；根據“However, a later study in the 1950s proved this way to be wrong”可知B錯誤；根據“Scientists have found that the chemical compositions (成分) of Earth and the Moon are very similar.”可知C正確；根據“That suggests that the Moon actually came from Earth. ”和“It is also possible that when Earth first came into being”可知只提出兩種可能，故D錯誤。故選C。