按照我国宪法规定，现阶段我国经济形式主要有（）、（）、（）、私营经济和“三资”企业。
参考答案：全民所有制经济；劳动群众集体所有制；劳动者个体经济
情景对话。
M: Hi, Sandra! How l. _______ you?
W: I'm 2. _______,thanks. And you?
M: I'm fine, 3. _______ What's the 4. _______today?
W: It's August l0th, Bill.
M: 5. _______ is your birthday?
W: My birthday is August l0th.
M: It is today. 6. _______ Birthday, Sandra!
W: Thanks! I'II have a birthday 7. _______ 8. _______ you come?
M: Yes, I can! How 9. _______ are you?
W: Oh, I don't want you to 10. _______. It is a secret (秘密), ha-ha.
绞窄性肠梗阻是指（）。
A.无机械性因素存在的肠梗阻
B.肠壁血运障碍所致的肠梗阻
C.肠壁肿瘤引起的肠梗阻
D.肠内容物运行停止所致的肠梗阻
E.肠壁肌肉过强收缩引起的肠梗阻
