生产经营过程中最容易造成事故的主要原因是“三违”，即违章操作、违章指挥、违反劳动纪律。
参考答案：对
— How would you like your coffee?
— _____.
[ ]
A. It's well done
B. Very nice. Thank you
C. One cup. That's enough
D. The stronger, the better
Although he is very old, _____ he works very hard. [ ]
A. and
B. but
C. /
D. so
