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4. As we all know,the moon is a s of the earth.

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3. Anything that is dropped falls towards the centre of the earth because of the pull of g .

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2. A p is a scientist who has special knowledge and training in physics.

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1 . A b is a scientist who studies biology.

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6. She studied hard;(因此她獲得面分) 

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5. The couple brought up their children on low incomes. Now the children, (輪到他們) ,should look after their elder parents.

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4. Do you believe (火星上有生命) ?

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3. Luckily,the doctor (及時前來挽救了他的生命) .

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2. What can we do to (防止這種疾病蔓延) ?

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1. She (生了一個健康的嬰兒) last night.

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