It is difficult for any of us to eat better, exercise more and sleep enough _________ we know we should.
A．despiteB．even thoughC．a(chǎn)s if D．unless
B
考查詞性詞義：A. despite介詞，雖然，B. even though連詞，既然，C. as if 連詞，好像，D. unless連詞；除非，句意是：我們每個人想吃得好，多鍛煉，睡眠足夠都很難，即使我們知道應(yīng)該這么做。選B。A的詞性不對。
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