1. (2020九上·沈阳竞赛) 阅读回答问题

Sir Patrick Moore was a well-known astronomer with a good sense of humour. Like many scientists, he enjoyed playing harmless jokes on people. Some years ago, he received an invitation to give a series of talks on the radio. One day, at the end of his talk, the host said, " Your next talk about gravity will start at 9 a. m. on the first of April — April Fool's Day. Why don't you play a joke on the listeners?" Patrick Moore agreed.

Over the next few days, Patrick Moore could not think of a joke.

However, on his way to the radio station on 1^st April, he saw some children jumping up and down in the street. That gave him an idea.

He arrived at the station and gave his talk. At the end of his talk, he told his listeners. " The planets Jupiter and Saturn are very close to each other this morning. This will reduce the gravity of the Earth. If you jump into the air at exactly 9:47a. m. , you'll be able to float for several seconds. "

A few minutes after 9:47a. m. , the phones began to ring. Some people said," You just played a joke on us." some said," We obeyed your instructions but didn't float in the air!"

1. （1） Who was Sir Patrick Moore?
3. （2） Where did Sir Patrick Moore give talks?
5. （3） What are Jupiter and Saturn?
7. （4） According to Sir Patrick Moore, how could his listeners float?
9. （5） The listeners didn't float, did they?