图3为某学校学生参加社会实践活动设计的改进型大棚。该图中不包含的原理是
A．温室效应原理
B．水循环原理
C．节水农业的生产原理
D．热力环流形成原理
D
What does the speaker mean a. Mary sings the best in her grade. b. The speaker has no idea whether Mary sings well. c. Mary’s singing skills are inferior to a lot of her classmates. d. Mary’s singing skills rank the second in her class.
胃痛的治疗除理气外尚需要（）
A.消食导滞
B.和胃止痛
C.温胃散寒
D.通络止痛
E.化湿泄热
