爆炸品叠氮银受（）易于分解，所以保管时必须放在背光的库房里。
A、光照
B、加热
C、撞击
D、潮湿
参考答案：A
期货公司经营期货经纪业务又同时经营其他期货业务的，应严格执行业务分离和资金分离制度，不得混合操作（）。
Almost all of his time ______ experiments, he has no time to visit his parents.
A．devoted to do
B．devoting to doing
C．devoted to doing
D．is devoted to doing
