The survey shows that ______ we are enjoying less and less good sleep, rates of heart diseases have risen rapidly．
A．whileB．a(chǎn)lthough C．if onlyD．a(chǎn)s though
A
句意：調(diào)查顯示當(dāng)我們正在享受著越來越少的好睡眠時，心臟病的發(fā)病率卻迅速地上升。A. while當(dāng)…的時候；和…同時；B. although盡管，雖然；   C. if only 只要，要是……多好；D. as though仿佛，好像；由句意可知選A。
考點: 考查連詞和代詞的用法。
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