________ it is you’ve found, you must give it back to the person it belongs to.

A． That

B． Because

C． Whatever

D． However

化学风化作用是指岩石在水、氧气、二氧化碳等作用下发生（）而产生新矿物的作用。

A.化合

B.结合

C.分解

D.破碎