题目

将这只电流表接入图（丙）所示电路，在闭合开关S的瞬间，电流表指针向左偏，则电源的端为正极（选填“A”、“B”） 答案：【1】A用括号中所给单词的适当形式填空。【1】There _____(be) a forest here long long ago.【2】A little boy wanted _______(catch) butterflies in the flowers, but they ________ (fly)away.【3】The weather _______(become) cloudy and windy this morning, so I _______(not )go out.【4】On the National Day we _______ (go) to the farm and _____(pick) many apples.【5】It’s _______ (Bobby) turn.【6】We are very ______(happy) to see each other.【7】What a _______(sun) day!