It was the first day of biology class. The teacher wanted to give a good 1  to his class. He wanted to  2  his students’ eyes to the world of biology.
He knew that 3  young students was not easy, so he worked 4  and tried to find a good way to teach this class.5  thinking for a long time, he made a 6  at last. He decided to show the kids something 7  and teach them a lesson at the same time.
He asked his students to 8  carefully. Then he began. He put a worm(虫子) into a glass of water. The worm 9  around in the water. Then he put a second worm into a glass full of alcohol(酒精). It died at once. He asked the students if anyone knew about 10  they learned from it. A boy said, “You showed us that if we drink alcohol we won’t have worms.”

The teacher wanted to know ______.

1. A.
   why was he late for school
2. B.
   how he can answer this question
3. C.
   if he could finish them on time
4. D.
   whether his parents are strict with him

It was the first day of biology class. The teacher wanted to give a good 41  to his class. He wanted to 42  his students’ eyes to the world of biology.
He knew that 43   young students was not easy, so he worked 44  and tried to find a good way to teach this class. 45  thinking for a long time, he made a 46  at last. He decided to show the kids something 47  and teach them a lesson at the same time.
He asked his students to 48  carefully. Then he began. He put a worm(虫子) into a glass of water. The worm 49  around in the water. Then he put a second worm into a glass full of alcohol(酒精). It died at once. He asked the students if anyone knew about 50  they learned from it. A boy said, “You showed us that if we drink alcohol we won’t have worms.”

阅读短文，从方框中选择适当的词并用其正确的形式填空，使短文意思通顺、完整，其中有两项是多余的。

It was the first day of biology class. The teacher wanted to give a good 41  to his class. He wanted to 42  his students’ eyes to the world of biology.

He knew that 43   young students was not easy, so he worked 44  and tried to find a good way to teach this class. 45  thinking for a long time, he made a 46  at last. He decided to show the kids something 47  and teach them a lesson at the same time.

He asked his students to 48  carefully. Then he began. He put a worm(虫子) into a glass of water. The worm 49  around in the water. Then he put a second worm into a glass full of alcohol(酒精). It died at once. He asked the students if anyone knew about 50  they learned from it. A boy said, “You showed us that if we drink alcohol we won’t have worms.”