H．ow long did the Knights of Labor last?

A． 60 years.

B． 31 years.

C． 50 years.

D． 21 years.

[单选题]H．ow long did he stay in the elevator?A． Twenty-four hours. B. From Saturday to Monday.C． More than sixty hours. D. From Tuesday to Saturday.

[单选题]H．ow long did the New York blackout in 1977 last?A． A whole night.B． Twenty-four hours.C． A whole week.D． Three days.

[单选题]H．ow long did he spend on his way to the place for his performance?A． One hour. B. Two hours.C． four hours and three quarters. D. One hour and a quarter.

[主观题]鲍勃将跳远的世界纪录保持了多久？H．ow long did Bob __________ the world __________ in the long jump?

[主观题]鲍勃将跳远的世界纪录保持了多久？H．ow long did Bob________ the world_________ in the long jump?

[单选题]H．ow did the accident happen?A．A lorry hit a car.B．A car ran into a lorryC．A bank clerk rushed into the street.

[单选题]H．ow did the acidcent happen ?A．a longhit a carB． a car ran into a lorryC． a bank clerk rushed into the street .

[单选题]H．ow did the accident happen?A． a lorry hit a carB． a car ran into a lorryC． a bank clerk rushed into the street

[单选题]H．ow did the accident happen?A．A lorry hit a car.B．A car ran into a lorry.C．A bank clerk rushed into the street.

[单选题]A．t the beginning, how did many scientists view Peppeberg's work?A． It would reveal a creature's mind.B． It would probably end in failure.C． It would be hard to judge its value.D． It would be a long-term project.