D．High blood pressure.

　　解析：选C　细节理解题。由第三段中的"something else is partly to blame: prescription and non­prescription medications"可知。

2．Steroids are mentioned mainly to prove that TriCalm is ________.

　　A．safe　　　　　　　　 B．cheap

　　C．effective D．traditional

　　解析：选A　推理判断题。由第五、六段可知，含有类固醇的药物有加剧瘙痒等副作用，而TriCalm不含类固醇，也就不会有此类副作用，所以比较安全。

3．According to the text, TriCalm ________.

　　A．has a competitive price

　　B．can only be used by adults

　　C．can only be bought in drugstores

　　D．provides a good after­sale guarantee

　　解析：选D　推理判断题。由倒数第二段可知，TriCalm如果对于购买者不见效，购买者可以将空管寄回从而得到全额退款。也就是说它有好的售后保证。

　　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 athletes to wear helmets. Helmets help reduce the force of a hit. The hard outer shell spreads the force over a larger area. Inside a helmet, a plastic or air­filled lining also helps soften the blow.