急性阑尾炎,容易发生阑尾坏死、穿孔的主要原因是
A.阑尾系膜短易屈曲扭转
B.阑尾开口较小
C.阑尾淋巴组织丰富
D.阑尾动脉系终末支,易导致血运障碍
参考答案:D
Write the correct words. 根据句子意思写出括号中所给单词的相应形式。
1. Today is a (sun) day.
2. Friday is the (six) day of a week.
3. His father is a (work).
4. Jenny (go) to school by bus.
5. Stand on your (foot). Danny!
—When did you ?
—I've here for half a day. [ ]
A. arrive; arrived
B. reach; come
C. reach; reached
D. arrive; been