以（)为基本未知量的求解方法称为力法。

图示对称超静定结构，力法计算时基本未知值最少为

A、12

B、9

C、8

D、3

A、

B、

C、

D、

Mr Johnson had never been up in an airplane before and he had read a lot about air accidents, so one day when a friend offered to take him for a ride in his own small plane, Mr Johnson was very worried about accepting.Finally, however, his friend persuaded him that it was very safe, and Mr Johnson got on the plane.

His friend started the engine and began to taxi(滑行) onto the runway of the airport.Mr Johnson was very frightened and closed his eyes.

After a minute or two he opened them again, Looked out of the window of the plane, and said to his friend, “Look at those people down there.They look as small as ants(蚂蚁), don't they?”

“Those are ants,” answered his friend.“We’re still on the ground.”

1、The best title(标题) for this passage is() .

A.First Flight

B.First Accident

C.First Experience

D.First Trip

2、When his friend suggested a plane trip to him, Mr Johnson().

A.accepted gladly

B.accepted unwillingly

C.refused the offer

D.showed his anger

3、When Mr Johnson opened his eyes, the plane().

A.was flying in the air

B.had landed

C.was still taxing along the runway

D.had taken off

4、Mr Johnson thought that he was () when he looked out of the window.

A.flying high

B.falling out of the plane

C.on the ground

D.dreaming

5、Mr Johnson seems to be a ()man.

A.brave and wise

B.polite and humorous(幽默的)

C.careless and rough

D.shy and easily frightened