题目

请听材料,回答问题 （1） Why is Tuesday a problem for Mr. Clark? A . Because he has classes on that day. B . Because he has a business trip on that day. C . Because he has a teachers' meeting on that day. （2） How will the students go to the museum? A . By train. B . By bus. C . By subway. （3） How much do they pay for a ticket in a student group? A . $12. B . S20. C . $15. （4） What can we learn from the monologue? A . The museum is closed on weekends. B . They're going on the school trip on Thursday. C . Students have to get 如图是某些生物的生殖和发育过程示意图，其中①代表受精过程，②代表发育过程。请据图回答下列问题：（1）若图中生物体代表被子植物，受精卵形成后会发育成种子的______，在种子的外面常有_____包被。（2）若图中生物体代表蝗虫，过程②需要经历受精卵、若虫、成虫，这种发育属于___________。（3）若图中生物体代表青蛙，过程的①特点是________________。（4）若图中生物体代表人，产生生殖细胞A的器官是_______；受精卵染色体数目为___________。