题目

The students ______ their homework every day.But they ______basketball now. A．do；play                                                  B．doing；playing C．are doing；are playing                               D．do；are playing 答案：由every day可知前一句是一般现在时；由now可知后一句是现在进行时。 答案：D如实物图所示，以下判断正确的是( ) A. 灯L1与灯L2并联，电压表测灯L1两端的电压B. 灯L1与灯L2并联，电压表测灯L2两端的电压C. 灯L1与灯L2串联，电压表测灯L1两端的电压D. 灯L1与灯L2串联，电压表测灯L2两端的电压