补全句子。（共5小题；每小题1分，计5分）

请根据上下文的意思，用括号内所给单词的恰当形式补全短文。每个空格只准填一个单词。

My mother is very nice. She is a 小题1:      （work） in a clothes store. She usually gets up at 6：30. Then she cooks breakfast for me. After小题2:_____         （have） a bowl of porridge and some broccoli，she goes to work at 7：30. There 小题3:         （be）usually many people in her clothes store. So she is very busy.

My mother’s work in the morning is over at 11：45，and                                                                       starts again at 1：30 in the afternoon. So she has to have lunch in the store. Her work in the afternoon  小题4:         (end) at 5：30，and she goes home at 6：30. Then she has dinner with 小题5:         (we）at home. After dinner we watch TV together.

如图所示为降温所用的一个小型电风扇电路简图，其中理想变压器的原、副线圈的匝数比为n，原线圈接电压为U的交流电源，输出端接有一只电阻为R的灯泡和风扇电动机D，电动机线圈电阻为r。接通电源后，电风扇正常运转，测出通过风扇电动机的电流为I，则下列说法正确的是

A．风扇电动机D两端的电压为Ir

B．理想变压器的输入功率为＋

C．风扇电动机D输出的机械功率为

D．若电风扇由于机械故障被卡住，则通过原线圈的电流为