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听力习题：

　　26.

　　A. Synthetic fuel.

　　B. Solar energy.

　　C. Alcohol.

　　D. Electricity.

　　27.

　　A. Air traffic conditions.

　　B. Traffic jams on highways.

　　C. Road conditions.

　　D. New traffic rules.

　　28.

　　A. Go through a health check.

　　B. Carry little luggage.

　　C. Arrive early for boarding.

　　D. Undergo security checks.

【责任编辑：屈应兰】