Look at this. What's this in English, do you know? Ah, it's a photo. Who's that in the photo? It's Li Yan. Li Yan is my good friend. She is a beautiful girl. Who's that? The boy in black? It's Jim. He is an English boy. He is very cool. He is my friend, too. We are all in Class 3,Grade 7. I like Jim and Li Yan.

要准备一期“近代中国摄影作品展”，你认为不可能收集到的历史照片是(    )

起始于春秋时期的我国盐铁专卖政策迎来重大变革。从2016年起我国将废止盐业专营有关规定，允许食盐流通企业跨区经营，放开所有盐产品价格，放开食盐批发、流通经营。这将有利于（   ）

①刺激食盐生产，扩大食盐消费量   ②打破垄断，促进市场竞争

③丰富食盐品种，提高食盐的价格   ④改进技术，提高食盐品质

下表是非洲和欧洲某年人口增长的相关数据。读下表，完成以下问题。

 金属M与AgNO₃溶液发生反应：M+2AgNO₃=M（NO₃）₂+2Ag，下列说法正确的是（　　）