Section BDirections: In this section you will hear 3 short passages. At the end of each p
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Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
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A．A summer heat wave.
B．The warming trend.
C．A global disaster.
D．The greenhouse effect and attendant problems.
请帮忙给出正确答案和分析，谢谢！