甘油类钻井液（）且对环境无污染。A、易维护、损耗少 B、易维护、损耗多 C、不易维护

引起兴奋的刺激应具备哪些条件?

–Can you speed it up a little? I’ll be late for my flight.

--______.I’m taking a shout cut . We’ll make it on time.

A．Go a head

B．I can’t agree more

C．Take it easy

D．I have no idea.

. The concert was a great success--there wasn’t a single empty seat in the concert hall, ____ it was very cold.

A．because

B．when

C．unless

D．although

Good use _____ the natural resources to improve people's life in this area. [ ]

A. has been made of

B. has made of

C. has made

D. has been made

定点零售药店外配处方的保存年限是（）

A．1年

B．2年

C．3年

D．4年

E．5年