閱讀短文，根據(jù)短文內(nèi)容，從短文后的五個選項中選出能填入空白處的最佳選項。每個選項只能用一次。

Careful and careless are as different as fire and water. But it is strange that quite a few scientists have both these qualities (品質(zhì)). They are both careful and careless.

1. .

Once Newton invited a friend to dinner at home. When they were ready to eat, Newton left to get a bottle of wine (酒). 2. , Newton still didn’t come back. At last his friend found Newton in his lab. When Newton was going to get the bottle of wine, he suddenly had a new idea for his experiment. So he quite forgot his friend and the dinner. Another time, Newton was leading a horse up a mountain, and he held the rein (韁繩) in his hand. While he was walking along, he kept thinking about problems. 3. , he found that the horse was gone.

Einstein was another example. 4. . While waiting, he became lost in thought. It started to rain. The rain kept on for some time. When he took out a piece of paper to write something down, the paper was wet and then he knew that it was raining. 5. , he again forgot he was standing in the rain

A. But after he put the paper into his pocket

B. But after his friend had waited for a long time.

C. Once he was waiting for a friend at a bridge

D. Newton, the famous English scientist, was such a person

E. When he got to the top of the mountain

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