A．Humourous.

　　B．Critical.

　　C．Frightening.

　　D．Concerned.

　　解析　推理判断题。文章生动形象地刻画了印度公共交通工具上的众生相，根据文章中的多处细节描写可知作者笔调“幽默”。后三项分别表示“批判的”“令人恐惧的”“担心的”，都不是本文的写作风格。

　　答案　A

　　阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。

　　Below is a selection from a popular science book.

　　If blood is red，why are veins(静脉) blue?

　　Actually，veins are not blue at all.They are more of a clear，yellowish colour.Although blood looks red when it's outside the body，when it's sitting in a vein near the surface of the skin，it's more of a dark reddish purple colour.At the right depth，these blood­filled veins reflect less red light than the surrounding skin，making them look blue by comparison.

　　Which works harder，your heart or your brain?

　　That kind of depends on whether you're busy thinking or busy exercising.Your heart works up to three times harder during exercise，and shifts enough blood over a lifetime to fill a supertanker.But，in the long run，your brain probably tips it，because even when you're sitting still your brain is using twice as much energy as your heart，and it takes four to five times as much blood to feed it.

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