工程师法压井的压井液密度（）增加钻井液密度附加值。
A.在压井后
B.在压井前
C.在压井过程中
D.大幅度
参考答案：A
选词填空。
1. It's Chinese New __________ (Year's Years') Day.
2. Everyone __________ (put, puts) on new clothes.
3. I like new red clothes __________ (for, of) New Year's Day.
4. In the evening, our family __________ (has, having) supper together.
5. Pork __________ (is, are) meat from pigs.
城市噪声可分为以下几类（）。
A、交通噪声
B、工业噪声
C、建筑施工噪声
D、社会生活噪声
