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1.The (change) are gradual and require a lot of efforts and work，like cleaning up a polluted river. 答案 changes 2.But Jane knew from past experience that her (choose) of ties hardly ever pleased her father. 解析 考查名词。根据句子结构可知，此处为宾语从句的主语，且在形容词性物主代词her之后一定要用名词形式。 答案 choice 3. Some like to call their friends，sometimes many times day. 解析 考查不定冠词。有些人喜欢给朋友打电话，有时一天打很多次。a每一，表泛指，相当于per。 答案 a 4. I remember taking English class in college on the short story. 解析 考查不定冠词。我记得在大学时上了一节关于短篇小说的英语课。名词class为可数名词，前面缺少冠词修饰，注意English前的冠词应为an。 答案 an 5. Now years later，this river is one of most outstanding examples of environmental clean－up. 解析 考查定冠词。这里是“one of＋ the ＋可数名词的复数”结构，表示“……之一”。 答案 the 6. On the other hand, chopsticks reflect | 
