我国长江、黄河、珠江均注入的海洋是（  ）

⑴How are you? ____                                          A. I'm going by plane.

⑵Which season do you like best?____              B. I often go hiking.

⑶How are you going to Kunming?____            C. You're welcome.

⑷What do you do on the weekend?____          D. I like winter best.

⑸Whose skirt is this?____                                  E. Fine.

⑹Did you watch TV last night?____                   F. Twenty yuan.

⑺Thank you!____                                               G. Yes, I did.

⑻How much are the shorts?____                      H. It's Sarah's.

⑼What is he like?____                                       I. Sixteen.

⑽How many erasers do you have?____            J. He is old and fat.

①推动旅游业供给侧结构性改革

②维护旅游市场秩序，提升旅游品质

③推动旅游消费，提高景区价格

④调节游客流量，维护景区环境卫生

20世纪50年代，一位农民创作了一首“稻谷赶黄豆，黄豆像地瓜，芝麻赛玉米，玉米比人大”的民歌。你认为这首民歌创作的时期是（   ）