单选题
下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题确定1个最佳选项。
{{B}}第一篇{{/B}}
第一篇

Accurate Timer

These days time is everything. Between meetings and appointments, deadlines and conference calls, my schedule requires that I know the time down to the minute. Even on weekends, I have a football team to coach, shows to tape and planes to catch. If I'm late, I'm sunk. The problem is that it's hard if my clocks aren't correct. Even the digital clocks can display time inaccurately. Dead batteries, time changes, any of these can cause a clock to be inaccurate. Now there is no need to worry, because advanced radio technology has produced a clock which gets the time directly from the U.S. Atomic Clock in Fort Collins, Colorado, the standard for time-keeping all over the world. The Atomic Clock by Acorn is the most accurate, reliable and convenient timepiece you can have.
Every morning at 1:00 a. m, this "smart" clock in Colorado automatically resets itself to the exact hour, minute and second. The U. S. Atomic Clock is accurate to ten billionths of a second per day. This means that the clock deviates less than one second over a one million-year period. The Atomic Clock even adjusts automatically for daylight saving time, so you don't have to remember to "spring forward" or "fall back". The desktop clock model is the only atomic Clock that will not lose time with low power or when you change its batteries.
The most accurate clock in the world is of no use if it is difficult to operate. The Acorn Atomic Clock is engineered in Germany using the latest scientific technology. It comes in two styles, the wall clock and the desktop model. Both are designed to be functional and easy to use. The desk clock's display features the exact time (in hours, minutes and seconds), month and date, or you can choose to display any two U. S. or world time zones. It weighs only eight ounces, and is the perfect travel clock It also has dual alarms, perfect for couples. Both the desktop and the wall models have an internal antenna for good reception without unattractive wires.
单选题 What is the passage mainly about?
【正确答案】 C
【答案解析】[解析] 本题考查考生对文章主旨的把握。考的是文章的主旨大意。通篇都在讲述这个先进的原子钟，讲它的各种特点和功能。而且文章的题目也给读者提供了线索。所以，正确答案是C。
单选题 The U.S. Atomic Clock is so accurate that______.
【正确答案】 B
【答案解析】[解析] 本题考查考生对细节的把握。考的是艾克瑞恩制作的原子钟计时的精确程度。答案的线索在第二段第二、三句话：The U. S. Atomic Clock is accurate to ten billionths of a second per day. This means that the clock deviates less than one second over a one-million-year period. 所以，正确答案是B。
单选题 The U.S. Atomic Clock adjusts automatically for______.
【正确答案】 B
【答案解析】[解析] 本题考查考生的逻辑推断能力。考的是艾克瑞恩制作的原子钟能够在哪个季节自动调整时间。答案的线索在第二段倒数第二句话：The Atomic Chock even adjusts auto-mtically for daylight saving time. so you don't have to remember to “spring forward” or “fall back”.既然你无须记住春天向前拨或秋天向后拔，说明在春秋季间(即夏季)，它会自动调整时间。所以，正确答案是B。
单选题 Why does the writer want to know the time down to the minute?
【正确答案】 D
【答案解析】[解析] 本题考查考生把握细节的能力。考的是作者为什么要把时间精确到分钟。答案的线索在第一段第一句话：These days timing is everything. Between meetings and appointments，deadlines and conference calls，my schedule requires that I know the time down to the minute.所以，正确答案是D。
单选题 Which of the following about the U.S. Atomic Clock is NOT true?
【正确答案】 B
【答案解析】[解析] 本题考查考生的综合判断能力。考的是有关原子钟的判断不正确的说法。选项A：它有双重闹铃。文章第三段倒数第二句话：It also has dual alarms. perfect for couples.谈到了这一点。选项C：由于重量轻，它是完美的旅行钟。文章第三段倒数第三句话：It weighs only eight ounces，and is the perfect travel clock. 谈到这一点。选项D：它显示两个时区。文章第三段倒数第四句话：The desk clock's display features the exact time(in hours, minutes and seconds)，month and date，or you can choose to display any two U. S or world time zones.谈到它可以显示任意两个美国或世界时区。选项B：它有外置天线，这和文章第三段最后一句话：Both the desktop and the wall models have an internal antenna for good reception without unattractive wires不符，所以正确答案是B。