As we all know , bad eating habits and a       of exercise may lead to health problems .
A．lackB．limitC．needD．demand
A
考查動詞。lack缺少；limit限制；need需要；demand要求。句意：我們都知道，不良的飲食習(xí)慣和缺少鍛煉會導(dǎo)致健康問題。
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