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阅读理解。

     Mr. and Mrs. Jones were going on their vacation  with their children, and they must arrive at the

airport before 11:40 the next morning. "It takes us thirty minutes to get there in a car," Mr. Jones said,

"so we must get ready before eleven o'clock. Don't be late."

     At ten-fifty, all of them were busy doing something, but Mrs. Jones wasn't. She sat quietly in a chair

in the garden and enjoyed the good weather.

     Mr. Jones and the children were surprised, but Mrs. Jones said, "Don't worry! Before I went to bed

last night, I made all our clocks and watches twenty minutes ahead (提前). Now we can get to the

airport early."

1. Why did the Jones family have to be ready before eleven o'clock?

A. Because they were going to a party.

B. Because they must arrive at the airport at 11:40.

C. Because they had to go to a town.

2. How long does it take to go from Mr. Jones' house to the airport by car?

A. Twenty minutes.

B. Thirty minutes.

C. Fifty minutes.

3. Mr. Jones and the children were _____ when they saw Mrs. Jones sitting in the garden.

A. sad

B. happy

C. surprised

4. Why did Mrs. Jones sit quietly?

A. Because she made all the clocks and watches ahead and they wouldn't be late.

B. Because she didn't like to spend her vacation.

C. Because she wanted to stay at home.

5. What time was it in fact when Mr. Jones and the children were busy doing things?

A. It was ten-fifty.

B. It was eleven-ten.

C. It was ten-thirty.

已知实数a，b同时满足a²+b²-11=0，a²-5b-5=0，则b=______．

心脏停搏早期的主要诊断依据是（）。

A.发绀

B.瞳孔散大

C.大动脉搏动和神志消失

D.脑电波消失

E.心电图呈室颤

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