用来调制蚝油汁味型的调料有______。
A．白糖
B．米醋
C．腐乳
D．鲜汤
E．花椒面
F．五香粉
参考答案：A,D
Qinghai-Tibet Railway(青藏铁路) was completed last year. It is the __________ railway that connects Tibet with the other parts of China.
A．first
B．second
C．third
D．fourth
阐述被保护对象风险评估的含义。
