>>>>自考萬題庫：歷年真題在線測試 點擊下載>>

　　>>>>2017自考名校VIP特招班最后名額>>

　　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(guān)的句子是：Ball lightning, the rarest and most mysterious form, derives its name from the small luminous ball…，關(guān)鍵詞是rarest(rare的最高級形式)與infrequently“很少發(fā)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(zhuǎn)換，因此選擇B或C，但是account for 意思是：(在數(shù)量方面)占;說明(原因等)不符合句意，因此不選擇B。

掃描/長按二維碼關(guān)注即可通過自考

獲取2017自考最新資訊

獲取最后6套預測卷

免費獲取8次直播課程

獲取歷年考試真題試卷

自考萬題庫【手機題庫下載】丨微信搜索"考試吧自學考試"

萬題庫自考2群：475010717

　　相關(guān)鏈接：

　　各地2017年自考大綱、教材目錄相關(guān)調(diào)整匯總

　　考試吧策劃:歷年自考真題及答案在線估分專題

　　2017年自考報名方法 ※ 2017年自考報名條件

　　各地自考報名入口 ※ 2017自學考試報考指南

　　2017自考時間安排 ※ 各地2017年自考報名時間