小丽同学在探究串联电路电流规律的实验中．如图所示连接电路，闭合开关S后，发现灯L₁、L₂均不发光，电流表示数为零．为判定电路中何处发生故障，她用一个电压表分别接到电流表、灯L₁、L₂的两端测量电压．测量结果是：灯L₁、灯L₂两端均无电压，电流表两端有电压．由以上实验现象，小丽分析找出了电路发生故障的原因．你认为电路的故障可能是

A．电流表断路；        

B．灯L₁断路；

C．灯L₂短路；          

D．灯L₂断路

按括号内要求完成改写后的句子，每空一词

小题1:We had a great party last weekend.(变为较难疑问句)

_____________ you _____________ a great party last weekend?

小题2:Mr. and Mrs. Smith are taking a walk at this moment.(变为否定句)

Mr. and Mrs. Smith ______________ _____________ a walk at this moment.

小题3:Mary goes to an art lesson on Sunday afternoon (就划线部分提问)

_____________ ______________ Mary go to an art lesson?

小题4:Please turn off the lights when you leave the room.(改写句子，句意不变)

Don’t _____________ the lights ____________ when you leave the room.

小题5:Premier Wne Jiabao says achieving GDP growth at average of 7% for the 12th Five-Year Plan will not be easy.（改写句子，句意不变）

Premier Wne Jiabao says it will not be easy ____________ ____________ GDP growth at average of 7% for the 12th Five-Year Plan