最有可能产生假性胎囊超声图像的是
A．卵黄囊
B．黄体囊肿
C．子宫蜕膜管型
D．盆腔炎性包块
E．卵巢实性肿瘤
参考答案：C
The village is ________ on all sides by green mountains, which is rich in natural resources.[ ]
A. surrounded
B. covered
C. divided
D. depended
协议和主机名之间用哪一种符号隔开（）
A．“：/”
B．“：\\”
C．“：//”
D．“：\”
