胚开始发育,种子充实,种皮硬化属于果实发育的哪个时期()。
A、果实迅速生长期
B、果实熟前生长期
C、果实缓慢生长期
D、果实成熟期
参考答案:D
A.I有=3/2A,Im=3A
B.I有=3A,I有=3A
C.I有= A,I有 A
D.I有3A,Im=6A
—________ the job in the police station exciting?
—Yes. But it is also dangerous.[ ]
A. Do
B. Does
C. Is
D. Are