试题与答案

细胞破碎的主要方法有机械破碎法、物理破碎法、（）、（）。

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题型：填空题

题目：

细胞破碎的主要方法有机械破碎法、物理破碎法、（）、（）。

答案：

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题型：阅读理解

阅读答问 阅读下面的材料，然后根据材料内容回答问题。

     Police in America were looking for a thirteen-year-old boy, Ben. He was a middle school student. He was

lost last Friday night.

     Ben's mother went to bed early that evening because she had a bad cold. She thought Ben was spending

the night with his friend. However, Ben did not appear at the family lunch the next day. She became worried

and called the police.

     That evening, Ben left home to play baseball with two friends. They both said Ben went home after the

game. Some neighbors said to the police they saw a UFO flying over Ben's house that night. So they thought

Ben might be taken away by aliens.

     The police said they would not give up until they found him.

1. When was Ben lost?

    ______________________________________________________________

2. What did Ben do with his friends that evening?

   ______________________________________________________________

3. What might happen to Ben according to his neighbors?

    _______________________________________________________________

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