網(wǎng)校每日一練免費(fèi)在線測(cè)試系統(tǒng)將為所有學(xué)員免費(fèi)提供練習(xí)題，所有學(xué)員登錄成功之后即可免費(fèi)練習(xí)。如有疑問(wèn)可以到答疑板與專家進(jìn)行交流，24小時(shí)之內(nèi)即可得到滿意答復(fù)。歡迎大家積極參與！

閱讀理解：

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(jí)形式）與infrequently“很少發(fā)生，少有”表達(dá)相同的意思。

相關(guān)推薦：

2015職稱英語(yǔ)考試真題及答案解析匯總

2016年衛(wèi)生類職稱英語(yǔ)備考基礎(chǔ)語(yǔ)法知識(shí)匯總一