具有喜润恶燥特性的内脏是（）。
A.胆
B.肺
C.脾
D.胃
E.肾
参考答案：B, D
Only when __________________ permission _______________ allowed to enter the lab.
A．a teacher has given; are the students
B．has a teacher given; are the students.
C．has a teacher given; the students are
D．a teacher has given; the students are
果实的果皮一般是由（）发育而。
A.珠心
B.胚珠
C.珠被
D.子房壁
