19．Many lifestyle patterns do such __ great harm to health that they actually speed up __weakening of the
human body．（　　）
A．a；/B．/； theC．a； theD．/；/

分析 句意：許多生活方式對人類的健康有害，他們加速了人類身體的衰退．

解答 答案B．第一空為固定短語do harm to"對---有害"；中間無需冠詞，第二空后的weakening是動名詞，表示衰退，根據(jù)句意，這里是特指"人類身體的衰退"，所以用the表示特指，故選B．

點(diǎn)評 本題考查冠詞的用法，要掌握固定短語的用法如do harm to"對---有害"．

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