直肠上静脉丛和直肠下静脉丛在何处互相交通（）
A.齿线附近
B.肛门皮下
C.肛管
D.肛门白线附近
参考答案：D
用所给动词的适当形式填空。
1. —Where is Tom?
—He _________ (read) in his room.
2. I _________ (see) Mr Wang go to the library just now.
3.—Oh, Mum! My stomach hurts a lot!
—Maybe you _________ (eat) something bad.
4. He said he _________ (telephone) her as soon as he got there.
5. She _________ (leave) by the time I arrived.
7620L电池容量为多少毫安？（）
A.1700mAh
B.2500mAh
C.1800mAh
D.1500mAh
) by the time I arrived.