解析：　词义猜测题。由划线处上文中的问题Why did you join the British Red Cross？可知，Liam Mills抓住机会加入了英国红十字会，由此推断，jumped at the chance意为"抓住机会"。

　　答案：　C

　　2．What does Liam Mills think of first aid?

　　A．Boring. B．Dangerous.

　　C．Easy. D．Attractive.

　　解析：　推理判断题。 由What's the big attraction？回答部分中的It's endlessly challenging and interesting可知，Liam Mills觉得急救工作是很有吸引力的。

　　答案：　D

　　3．What can we infer from the text?

　　A．All first aiders can use Entonox.

　　B．First aiders just do some simple work.

　　C．Liam Mills still lacks confidence in his work.

　　D．Liam Mills benefits from his first aid experiences.

　　解析：　推理判断题。由最后一段可知，Liam Mills从急救中也获益颇多，他认为这是一个双赢的局面。

　　答案：　D

　　B

　　In many sports，physical contact (身体接触) is part of the game.But when athletes hit their heads，the hit can cause concussions (脑震荡)．

　　Concussions have long been a concern for professional athletes，but they've become more common among young players too.Between 2001 and 2009，the number of kids under 19 visiting doctors for concussions each year increased by 62 percent.

　　Engineers are developing new helmets (头盔)，and new rules are limiting physical contact in some sports.But are these efforts enough to protect kids' brains?

　　Concussions can happen during many types of activities.But sports like football and soccer are especially risky.When you run or jump，your body is moving at an increased speed.A sudden hit causes you to move faster in a different direction.

　　"It's like when you're in a bus and it makes a sudden stop，" says Dr Kevin Crutchfield，an expert at a sports concussion center in Baltimore，Maryland."You hit the inside of the bus."

This hit damages the brain.It affects the way the brain functions.So some sports require