生产网络丝聊阿产品正确的操作是（）。
A、先挂丝再关喷嘴
B、先关喷嘴再挂丝
C、挂丝后过5分钟关喷嘴
D、关喷嘴后过5分钟再挂丝
参考答案：B
—Would you like to go to the movie with us tonight?
—Sorry, but I'm afraid that I to go out tonight.[ ]
A. am allowed
B. don't allow
C. will allow
D. won't be allowed
雪崩处理能力要求系统在（）点遥信连续变化。
A.100
B.200
C.1000
D.2000
