题目

（09年金山中学期末）将阻值为４Ω和10Ω的两个电阻Ｒ1 和Ｒ2 分别接到同一电源上，结果在Ｒ2 上消耗的功率Ｐ2 比在Ｒ1 上消耗的功率Ｐ1 大，则：A．只接Ｒ1 时整个电路的总功率一定大于只接Ｒ2 时整个电路的总功率B．两个电阻并联后再接到电源，外电路总功率一定小于Ｐ1 C．两个电阻串联后再接到电源，外电路总功率一定大于Ｐ2 D．电源的内电阻一定大于４Ω根据所提供的句子意思，用所给单词的正确形式填空，使句子意思完整。并在答题卡上将答案填写在对应题号的横线上。小题1:The old man lives on the _______ (five) floor.小题2:What about ________(climb) the mountains this weekend?小题3:She often ________ (do) her lessons in the afternoon.小题4:Please give us some ________ (advice) on what to do next.小题5:I can learn English by ________(my).小题6:Yao Ming is famous as a basketball ________(play).小题7:The little boy is sleeping now. Please be _______ (quietly).小题8:I think this dictionary is _______ (help) for your study.小题9:My cousin _______ (use) to eat junk food, but now he doesn't.小题10:Of the three apples, this one is the ________(big).