税源管理要实施（），对不同行业、不同规模、不同纳税信用等级的纳税人采取不同的管理方法。
参考答案：分类管理
用所给词的正确形式填空 。
1. (eat) too much is bad for your health.
2. You should (drink) much water when you have a fever.
3. He is not (feel) well because he is ill.
4. You don't look (good) today. You should see a doctor.
5. He has a headache; he should (go) to bed early.
