运输指数是衡量（）危险品的指标。
A．第8类
B．第7类
C．第6.1类
D．第9类
参考答案：B
The members of the board are discussing the problem right now; it will _____ have been solved by the end of next week．
A．luckily
B．immediately
C．hopefully
D．undoubtedly
血液管理
