剧毒类的有机磷杀虫药是( )
A．毒鼠磷B．甲胺磷C．敌敌畏D．敌百虫E．氯硫磷
参考答案：A
如图，甲、乙两处有一处是电源，另一处是用电器，在中间用小磁针测试，发现P处小磁针N极指向纸外，Q处磁针N极指向纸里，则______处是电源（选填“甲”或“乙”），R2中电方向______（选填“向右”或“向左”）．
His father believe in_____ very much, so he makes decisions all by _____.
A．he; him
B．his ; himself
C．he ; himself
D．him; himself
