Passage Two
"Go to the playground and have fun", parents will often say to their kids. But they should remember playgrounds can be dangerous. Each year about 200,000 children end up in hospital emergency rooms with playground injuries. Many injuries involve falls from too high equipment onto too hard surfaces. [29]Nearly 70 percent of the injuries happen on public playgrounds. Recent studies show they may be badly designed-their protective surfaces are inadequate, and their equipment is poorly maintained. Parents should make sure that the equipment in the playground is safe and their children are playing safely. Last year, the national program for playground safety gave the nation's playgrounds a grade of C for safety after visiting more than 3,000 playgrounds nationwide. [30]Parents should watch closely. They should always be within shouting and running distance of their children. Young children don't understand cause and effect, so they may run in front of moving swings. They're also better at climbing up than getting down, so they may panic at the top of a ladder. It's important for children to know you're watching them. [31]Once they feel that sense of security, that's when they can be creative.

Questions 29 to 31 are based on the passage you have just heard.
29. What is the cause of playground injuries?
正確答案：C
解析：題目詢問導(dǎo)致孩子在操場上受傷的原因是什么。關(guān)鍵是要聽到“差不多有70%的傷害都是在操場上發(fā)生的。近期的研究表明，這些操場的設(shè)計粗糙——保護層不足，器材的維修保養(yǎng)很差。”即C（操場的狀況很差）。選項A、B、D的內(nèi)容文中均未提及。
30. What should parents do to prevent playground injuries?
正確答案：B
解析：題目詢問為了防止孩子在操場上受傷，父母應(yīng)該做些什么。關(guān)鍵是要聽到“父母應(yīng)該密切注視（孩子們）”。B是原文的同義表達。A、C、D的內(nèi)容均與原文不符。
31. What does the speaker say about young children?
正確答案：D
解析：題目詢問作者說小孩子時怎么樣的。關(guān)鍵是要聽到最后一句：“一旦（小孩子）有了安全感，他們就能夠發(fā)揮創(chuàng)造力。”D是原文的同義表達，故為答案。