It's a habit which has been drummed into us from an early age, but the recent news about flossing your teeth could be a waste of time has put the spotlight on oral hygiene. 我们从幼时就开始培养刷牙的习惯,但最近却有报道称用牙线剔牙纯属浪费时间,这也...
14 The education of young has become hot and serious topic in the present society. A the;不填 B.a;the C.不填;the D the;a 15 He has good knowledge of many foreign languages,and one of them is English which is language spoken by many people in the wo...
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