綜合類-概括大意（1月25日）_職稱英語(yǔ)網(wǎng)校

概括大意與完成句子

Lightning can occur within a cloud, between clouds, or between clouds and the ground. The first variety, intra-cloud lightning, is the most frequent but is often hidden from our view. Cloud-to-ground lightning, making up about 20 percent of lightning discharges, is what we usually see. Lightning comes in several forms, including sheet, ribbon, and ball. Intra-cloud lightning can illuminate a cloud so it looks like a white sheet, hence its name. When cloud-to-ground lightning occurs during strong winds, they can shift the lightning channel sideways, so it looks like a ribbon. The average lightning strike is more than 3 miles long and can travel at a tenth of the speed of light. Ball lightning, the rarest and most mysterious form, derives its name from the small luminous ball that appears near the impact point, moves horizontally, and lasts for several seconds.

The main idea of this paragraph is ________.

A、How does Lighting Happen

B、Types of Lighting

C、Lightning Comes in Several Forms

D、Cause of Lighting

【正確答案】 B

【答案解析】 整個(gè)段落的內(nèi)容介紹了閃電的三種類型：云層內(nèi)部閃電，云層與云層之間的閃電，云層與地面之間的閃電，此外還介紹了閃電可有片狀、帶狀和球狀。因此選擇B 閃電的類型。

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