These green shorts are __________ sale ___________ $10.

A.on; at B.on; for C.for; of D.in; at

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—Is this pencil?

—Yes. The pen is , too.

A.your; my B.yours; mine

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We are not sure he will go to see a doctor or not tomorrow.

A.whether B.that C.what D.who

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Studnets’ Schedule（日程表）in July

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July 16th

July 17th

July 18th

July 19th

Joe

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A.Joe B.Judy C.Annie D.Mike

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一 __________ Mary _______ apples? -No, she doesn't. She likes pears.

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Imagine having an ear made out of an apple. It seems like a crazy idea from a horror movie. But it could happen in the near future.

Canadian biophysicist, Andrew Pelling used an apple to grow a human ear. He thinks fruit and vegetables can be used to cheaply repair human body parts in the future.

Scientists have been trying to grow organs( 器官) in labs to replace our old ones. But it is a hard Job. For example, liver cells( 肝細(xì)胞)can grow in a lab, but the cells still need things like blood vessels( 血管) to actually work. These things have to grow inside a scaffold(支架) In the past, scientists have used manmade materials, animal parts and even dead people as scaffolds. But that has proved to be difficult and expensive.

Pelling and his team, however, found the apple to be a cheap and easy to use scaffold.

They first out an apple into the shape of an ear. Then they used a special way to take out the apple’s cells and make it a scaffold. The team then added human cells to the apple and watched it grow

You can implant these scaffolds into the body, and the body will send in cells and a blood supply and actually keep these things alive, “Pelling said during a Ted Talk speech.

The team put the apple scaffold inside a living mouse and the mouse’s cells slowly took over the pieces of apple.

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d. Make the apple ear a scaffold.

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A.abcde B.bedae C.cedba D.cdaeb

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