Citizens in this country are now enjoying better dental health, as shown by the declining incidence of tooth .

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问题 Citizens in this country are now enjoying better dental health, as shown by the declining incidence of tooth .

选项 A、care
B、decay
C、growth
D、reflection

答案B

解析 本题考查句意的理解和单词的辨析。tooth care,关爱牙齿;tooth decay,龋齿;tooth growth,长牙;tooth reflection为不恰当的搭配。文中的decline指“下降”,能够显示出人们的牙齿健康状况更好,那就应该是龋齿发生的比率降低了,所以结合句意,答案选B。
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