世界上第一部完整统一的长篇小说是：（）
A、《三国演义》
B、《格列佛游记》
C、《红楼梦》
D、《源氏物语》
参考答案：D
用所绐单词的适形式填空当。
1. They are very strong and healthy.There is no need for them______ (have) a rest. They
need______( work)two more hours.
2. Li Hua doesn't seem ______( study) hard at school.
3. We often go to the movies with friends on______(weekend) .
4. We students should______(take) out all the things that will be used before a class begins.
5. Can you give me some advice about how______ (find) my missing dog?
试述NR的化学反应性。
