种子的主要结构是:
A.胚乳
B.子叶
C.胚
D.种皮
答案:C
胚可以发育成植物体,是新植物体的幼体,所以胚是种子的主要部分。
在B栏中找出A栏问题的答语.(10分)
小题1:What club does she want to join? A. He’s reading a book.
小题2:Are you using the computer? . B. I like cats.
小题3:What animals do you like? C. No, I don’t.
小题4:Can he play the guitar? D. Because they are friendly.
小题5:How do they get to school? E. They are from China
小题6:What time does he go to bed? F. He wants to join the music club.
小题7:Why does he like dogs? G. Yes, I am.
小题8:Where are pandas from? H. No, he can’t.
小题9:What’s he doing now? I. They ride their bikes.
小题10:Do you have to clean your room? J. At 9:30.
相对误差包括()、()、()。