1．a serious lack of water is a real________(屏障，障碍) for people wanting to settle in the desert.
答案： barrier
2．my toothache is________(难以忍受的)，so i must go to see my dentist.
答案： unbearable
3．although it was a________(复杂的) problem，he solved it in a very simple way.
答案： complex
4．as everybody knows，cancer doesn’t show any________(症状) in its early stages.
答案： symptom资源难易程度:★★★★★★★★★★★★★★★
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