It's Sunday afternoon. Michael's family have a picnic under (在……下面) a big tree. The woman in a blue T-shirt and white pants is Michael's mother. ⑴She is thirty-two. She is a teacher in No. 2 high School. She is cooking now. The man with a guitar is Michael's father. He is thirty-four years old. ⑵He teaches in the same school as Michael's mother. He is a teacher. Michael's little sister likes singing, but she isn't singing now. ⑶“为什么不和我一起去放风筝呢？”Michael问他的小妹妹。⑷Then she flies a kite with her brother. What a happy family!

2014年4月28日，国务院在重庆召开座谈会，就建设长江经济带做出了重要部署。生态安全关系长江经济带的可持续发展，目前长江上、中、下游各河段需要解决的生态和环境问题主要有(    )

①水土流失     ②洪涝灾害

③凌汛      ④水污染