听下面4段对话。每段对话后有1个小题，从题中所给的A、B、C三个选项中选出最佳选项。 1. What are they talking about?

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                   A                                      B                                        C 2. Where would Jim like to go if he gets enough money?

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                   A                                      B                                       C 3. When did Tom visit the Shanghai Expo with his classmates?

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                 A                                         B                                        C 4. How is the weather today?

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                A                                        B                                          C