________ you are responsible for the information, you must be very careful.
A．Unless
B．While
C．Since
D．Though
答案：C
题目分析：考查连词辨析。A除非，如果..不…；B当…时；然而；C既然；D尽管；句意：既然你负责这些信息，你就必须非常当心。根据句意说明C正确。
点评：连词辨析要在上下文语境中进行考查，根据语境语义搭配辨析。本题要注意unless=if…not…。
| 情景交际。 | |
| Jim: Tony, Lin Tao invited us to have dinner with his family. Tony: Really? I'd love to. 1 Jim: Sure. In China people put all the dishes on the table and everyone shares the food together. Tony: That's interesting. I hear they usually use chopsticks. Do they use spoons (勺子)? Jim. Yes. 2 Tony: Anything else about the table manners? Jim: Er ... sometimes the Chinese will use their own chopsticks to put food in your bowl to show their politeness. Don't refuse (拒绝) it. Tony: 3 Jim: Just say "thank you" and leave the food there. Tony: 4 Jim: Put them on the table or on your bowl. 5 It's impolite. Tony: I got it. Thank you.
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