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　　1.單選題

　　[完成句子]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.

　　One form of lightning that __________ is ball lightning.

　　A、occurs most infrequently

　　B、is shifted sideways by strong winds

　　C、is often hidden from our view

　　D、is estimated at 20 millions a year

　　正確答案：A

　　答案解析：本段文字與題目相關的句子是：Ball lightning, the rarest and most mysterious form, derives its name from the small luminous ball…，關鍵詞是rarest(rare的最高級形式)與infrequently“很少發生，少有”表達相同的意思。

　　2.單選題

　　[概括大意]Wignall calculated the “killing efficiency” for these volcanoes by comparing the proportion of life they killed off with the volume of lava that they produced. He found that size for size， older eruptions were at least 10 times as effective at wiping out life as their more recent rivals.

　　The main idea of this paragraph is__________.

　　A、Killing Power of Ancient Volcanic Eruptions

　　B、Accounting for the Killing Power of Older Eruptions

　　C、Calculation of the Killing Power of Older Eruptions

　　D、A Mass Extinction

　　正確答案：C

　　答案解析：本段第一句話是說：Wignall calculated the "killing efficiency" for these volcanoes…;Wignall 計算了這些火山的“滅絕效率”……;其中killing efficiency與killing Power意思差不多，屬于同義詞轉換，因此選擇B或C，但是account for 意思是：(在數量方面)占;說明(原因等)不符合句意，因此不選擇B。

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