（ ）在血液中O2的主要运输形式是HbO2，CO2的主要运输形式是碳酸氢盐。
查看答案
（ ）鼻既是呼吸道的起始部，又是嗅觉器官。
A. 对
B. 错
It'll only be a visit because we recently haven't much time.
A. precise
B. brief
C. sufficient
D. steady
The job is great advancement but the starting salary is rather low.
A. in the form of
B. in the hands of
C. in two minds
D. in terms of
We'd better pay that electricity bill before they us .
A. cut...off
B. cut .....down
C. cut .... back
D. cut .... up
微信支付 
支付宝支付