“篱笆扎得紧，野狗钻不进”这种想干却没干是因为缺乏（）
A.自身条件
B.动机
C.能力
D.外部条件
参考答案：D
用所给词的适当形式填空。
1. I enjoy _ (swim) in the river.
2. The best way of learning English is by (use) it.
3. A good language (learn) should have lots of practice.
4. When I hear the _ (exciting) news, we all got _ (excite).
5. His father was very _ (frustrating) because he was always for school.
生二次燃烧如何处理？
