在蒸发操作中，从溶液中汽化出来的蒸气称为（）
A.生蒸气
B.二次蒸气
C.加热蒸气
D.蒸发蒸气
参考答案：B
A new bridge _______ across the river in Changsha and it is expected to open next year.
A. is built B is being built C. are built D. has been built
可以治疗痛风的药物是（）
A.甲氨蝶呤
B.阿糖胞苷
C.氟尿嘧啶
D.别嘌醇
E.以上都不是
