6.The survey shows that ______ we are enjoying less and less good sleep,rates of heart diseases have risen rapidly.( 。
A.whileB.althoughC.if onlyD.as though

分析 調(diào)查表明當我們在享受越來越少的好睡眠時,心臟病的發(fā)病率卻在迅速上升.

解答 答案A.
while當…時候,引導時間狀語從句;although盡管,雖然,引導讓步狀語從句;if only但愿,引導條件狀語從句;as though仿佛,好像,引導方式狀語從句.賓語從句中前后兩句的邏輯關(guān)系是表示時間上的邏輯關(guān)系,再根據(jù)句子所表達的意思可知答案選A.

點評 本題考查從屬連詞.連詞的用法辨析,要注意分析主、從句之間的邏輯關(guān)系,再確定相應的連詞,同時注意不同的連詞的語義及用法區(qū)別.

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