题目

If you have a toothache, you'd better call the dentist's office and make a(n) ________.A.recommendation B.communicationC.excuse D.appointment 答案：【答案】D【解析】句意：如果你牙疼，你最好打电话到牙医诊所预约。考查名词辨析。recommendation介绍，推荐信；communication 交流；excuse借口；appointment约会，约定。根据“you'd better call the dentist's office”可知应该是预约牙医，make an appointment表示“预约”，符合语境，故选D。若xy≠0，x+y≠0，与x+y成反比，则（x+y）2与x2+y2A.成正比B.成反比C.既不成正也不成反比D.的关系不确定