Some exercises appear to be ________ ones that you have done, but after taking________ second look, you will find that they are different.

A./; the B.the; the C.the; a D./; a

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Many shops in China________to shut down as a new law against ivory trade came into effect on January 1st, 2018.

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—Jack is a(n) ________ young man.

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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 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 theory has not been confirmed because there is very little related evidence(相關(guān)證據(jù))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 if its core contained only iron and nickel. Today, scientists continue to bring forward different theories, 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(zhuǎn))very fast and threw off enough molten(熔化的)rock to later from the Moon.

1.What's the story mainly about?

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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.

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Helping others is a great thing to do. You can learn new things and have fun. There are many ways of helping others in your community. You can help people, animals or the environment(環(huán)境). It can make you feel good too! How can you help?

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Fundraising is when you collect money to help others. Ways of fundraising are:

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•giving your money to a charity.

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