能否取得满意教学效果的前提是（）。
A.教学环节严谨
B.评价是否到位
C.备课的充分与否
D.小结
参考答案：C
用所给词的正确形式填空。
1. The little boy fell off the tree and _____ (hurt) himself seriously.
2. She died after a long _____ (ill).
3. Doing eye exercises _____ ( be) good for your eyes.
4. Reading _____ (make)me happy.
5.There are many _____ (different)between the countryside and the big city.
下列关于溃疡性结肠炎的描述哪一项不正确（）.
A.是一种病因不明的直肠和结肠慢性炎症性疾病
B.其发病可能涉及免疫因素
C.其发病可能涉及遗传因素
D.与环境因素无关
E.可发生于任何年龄
