题目

We must __________ the right place to park our car.A．look atB．look forC．look afterD．look up 答案：B解析:略岩石按其成因分为三大类               （   ）A．花岗岩、岩浆岩、大理岩B．喷出岩、沉积岩、变质岩C．变质岩、侵入岩、沉积岩D．岩浆岩、沉积岩、变质岩