解析：朱溪河小流域水土流失地区主要分布于距村庄近、交通 方便、坡度较小且风化土层较厚的丘陵区，这些地区都是便于开垦 和樵采的地区，在人口快速增长的背景下，容易导致垦樵过度，致 使水土流失。 答案：D

12.最适宜石嘴山市转型发展的产业是 A.以风力发电为主的能源工业 B.服装加工等劳动密集型产业 C.航空航天等高新科技产业 D.生态农业和光伏设备制造业

W:Losing weight. M:You want to lose weight?You are joking! W:Well,I am serious.From now on,I will give up junk food, like sweets and hamburgers. M:I really don't believe it.You always say you are going to eat more fruits and vegetables,but you never manage it. (Text 8) W:What do you think of the airport? M:Well,it's far from downtown and when the traffic is bad,it can take an hour and a half to get there.The city really needs to build a new airport that is closer to the city. W:Do you usually drive to the airport? M:No.I usually take the airport bus.It's clean and comforta-

was urgent. W:You shouldn't have done that.You could have waited until this afternoon.Come in.I'll make you breakfast.And then you can sleep for a while. (Text 3) M:I've just got a call from the third floor.They said that their mail has not arrived yet.Is Ron here today?He's usually the one who takes it up. W:I just saw him on the second floor.He's passing out their mail still.They should just be patient. (Text 4) M:What kind of shampoo do you use to wash your hair? W:It's just a low-quality brand.Why do you ask?Do I look dirty

B.Teenagers fond of music. C.Students in music school. 20.What will the audience do next? A.Listen to a song. B.Sing a song together. C.Join the speaker on stage.

B.She is not so determined. C.She is satisfied with her figure. 听第8段材料，回答第11至13题。 11.What is the man dissatisfied with about the airport? A.The location. B.The parking lot. C.The service. 12.How does the man usually go to the airport? A.By car. B.By subway. C.By bus. 13.What does the man say about the check-in? A.It is fast.

【答案】25.more complex26.thought27.the28.hidden 29.is destroyed 30.usually 31.transporting 32.on 33.If 34.protection

【答案与解析】 数字秒表可能会产生高达0.11秒的舍入误差，这足以改变势 均力敌的比赛的结果。尽管设备记录时间非常准确，但它们在将 原始数据转换为人类可读值时经常出错。 21.A 根据第2段最后一句可知，浮点表示法广泛应用于数码设备。 22.D根据第3段第1、2句可知，数字秒表的误差是在浮点表示 法的数据转换成秒表显示屏可见的数字时发生的。 23.C根据第4段画线词所在句与上一句的转折关系可知，当被 记录的时间用类似于秒表显示屏显示数字的算法传递时，他们 又看到了（第3段提到的）不精确的数字。 24.D根据倒数第2段第1句可知，为了避免秒表的舍入误差， Faux建议将石英晶振的次数直接用更大的秒表显示屏显示，而 非用算法来转换摆动次数。

the screens of stopwatches,they once again saw a skewed num ber. Faux says that the obvious solution is for stopwatches to have large data tables for transforming the numbers of oscilla- tions into the time in seconds,rather than using an algorithm. The researchers now hope to investigate whether the errors are found at large sporting events. New Scientist asked the International Olympic Committee if timing at the Olympic Games could be affected by this phenome non.The IOC passed the request for comment to Omega,the of- ficial timekeeper of the Games,which didn't respond.

第二部分阅读理解（共4小题；每小题7.5分，满分30分） 阅读下面短文，从每题所给的A、B、C和D四个选项中，选出 最佳选项。 Digital stopwatches can make rounding(四舍五入的) errors of up to 0.11 seconds,which could be enough to change the win ner of close races.Although the devices record time extremely accurately,they often make errors when changing that raw data to human-readable numbers. Most digital stopwatches measure time by counting the pre- dictable oscillations (of a quartz crystal.The crystal will pulse many thousands of times a second and the final count is transformed into seconds in a format known as a floating-point representation that is commonly used by digital devices.