2013职称英语理工类A级概括大意测试（6）_第2页

　　About 2,000 thunderstorms are occurring in the world at any time, generating about 100 lighting strikes every second, or 8 million daily. Within the United States, lightning strikes are estimated at 20 million a year, or about 22,000 per day. You have a 1-in-600,000 chance of bring struck by lightning during your lifetime. Lightning can strike twice or more in the same spot. The Empire State Building in New York is struck by lightning about two dozen times annually.

　　You can measure how far you are from a lightning strike by counting the seconds between viewing the flash and hearing the bang, and then dividing by five. This approximates the mileage.

　　练习：1-4题的要求是，从第一个方框的六个选项A、B、C、D、E、F中选出四个选项为注明的段落各配一个合适的小标题。5-8题的要求是，从第二个方框的六个选项A、B、C、D、E、F中选出四个选项完成每个句子。

　　1. Paragraphs 2 and 3转自:考试站 examzz.com

　　2. Paragraph 4

　　3. Paragraph 5

　　4. Paragraph 6

　　A Cloud-to-ground lightning occurring in the U.S.

　　B Types of lightning

　　C Cause of lightning

　　D Differences between thunder and thunderstorm

　　E Frequencies of thunderstorms occurring in the world and the U.S.

　　F Shock waves as thunder

　　5. In most cases of cloud-to-ground lightning, the ground's surface …

　　6. One form of lightning that … is ball lightning …

　　7. Cloud lightning looks like a ribbon when its lighting channel …

　　8. Although not fully understanding processes of lightning, man …

　　A occurs most infrequently.

　　B is shifted sideways by strong winds.

　　C is often hidden from our view.

　　D is equipped with a good knowledge of various forms of lightning .

　　E is estimated at 20 millions a year.

　　F is positively charged.

　　KEYS: CBFE FABD