中暑是夏天体育运动中常见的现象，是由高温环境引起的，以体温调节中枢功能障碍、汗腺功能衰竭和水、电解质丢失过多为特点的疾病。
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幽默是智慧和成熟的象征，学会幽默、乐观地面对生活，才能使自己快乐起来，积极地面对工作。
A. 对
B. 错
- Shall we buy this piano music CD for Sally?
Read the following two texts about two electric cars and answer questions 1-10.
Read the following two texts about two airlines and answer questions 1-10.
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