For some obscure reason,the simple game is becoming very popular.

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参考答案: C

参考解析: 题干意为“不知什么原因，这个简单的游戏变得非常流行。”句中划线词意为“不清楚的，不明了的”。C项unclear不清楚的；例句：Reason of attack remains unclear，攻击的原因仍不清楚。A项明显的；B项较大的，主要的；D项较小的，不重要的；故选C项。

1 单选题 1.00分

Her comments about men are utterly ridiculous.

2 单选题 1.00分

He kept in contact with his family while he was in Australia.

3 单选题 1.00分

He inspired many young people to take up the sport.

4 单选题 1.00分

He was tempted by the high salary offered by the company.

5 单选题 1.00分

We must abide by the rules.