结肠造影的特征性表现是（）。
A.黏膜呈羽毛状改变
B.管腔扩张良好
C.管壁蠕动良好
D.黏膜呈弹簧状改变
E.结肠袋
参考答案：E
根据短文内容,在短文后的空格处填上一个恰当的词,使短文完整、通顺.
I 1 a pen pal. His name is Bruce.There 2 four people in his family. He is 13 3 old. He 4 from America.
He can 5 English and a 6 Chinese. He likes 7 sports. His favorite 8 in school is math. He thinks
China is a great 9 . He wants to 10 China next year.
1. 2. 3. 4. 5.
6. 7. 8. 9. 10.
（）是避免铅中毒的不正确方法。
A、注意搞好家庭环境和个人卫生
B、坚持饭前洗手
C、经常在马路边玩
D、婴儿长期接触铅，应及时送往医院检查和治疗
5 English and a 6 Chinese. He likes 7 sports. His favorite 8 in school is math. He thinks