A:produce
B:produced
C:are produced
D:was produced
第三次科技革命与前两次科技革命相比有下列特点( )
离体的植物组织或细胞在适宜条件下发育成完整的植株。离体的动物体细胞却没有发育成动物的成熟个体原因是( )
A. Have you got an email from Tom?
B. What did your mother have for lunch?
C. Does Lingling like hamburgers?
D. He says sandwiches are delicious.
E. I had eggs and milk.