三年来，集团公司着力搞好的三大主业？
参考答案：
煤、煤化工、铝。
—Recently I have read many _______ about the droughts in the south of China.
—Oh, the farmers will have a bad harvest this year. [ ]
A. reports
B. news
C. novels
D. speeches
何谓数字电路中竞争冒险现象？有什么方法可以消除？
