下表为简单因特网中路由及的路由表，路由器R对应目的网络40.0.0.0的下一步IP地址应为______。
A. 30.0.0.8
B. 20.0.0.6
C. 30.0.0.7
D. 50.0.0.4
查看答案
Americans______when they talk with Arabs.
A. pay enough attention
B. may lose their patience
C. speak more than a few sentences
D. will get to the point
What did the author do to make a living？
A. Delivering goods.
B. Driving a taxi.
C. Taking people to the airport.
D. Working in a store.
According to a recent American study, people start losing their mental ability______.
A. in their early teens
B. in their mid-sixties
C. in their mid-twenties
D. in their early thirties
According to this passage, Americans have a low opinion of people who______.
A. do not talk as much as possible
B. do not pay attention to the speaker
C. like to ask about other people's health
D. bring too many ritual greetings into a conversation
微信支付 
支付宝支付