下列哪种疾病不宜行钡剂灌肠()
A．溃疡性结肠炎
B．疑有结肠癌者
C．中毒性巨结肠
D．先天性巨结肠
E．疑有结肠梗阻者
参考答案：C
申请从事普通机动车驾驶员培训的驾驶操作教练员年龄不超过（）周岁。
A．50
B．55
C．60
D．65
根据句意和括号内所给单词的适当形式写出单词。
1. The light is red. You must wait. It's _______ (danger) to cross the road.
2. What's the _______ (mean) of this word, do you know?
3. Jenny is very kind. She often shares her (toy) with her friends.
4. My room is not as big as my _______ (brother).
5. Your sister is too young to dress _______ (she). Please help her, Ann.
