《天于加强农利留守儿童关爱保护工作的意见》提出，加强农村留守儿童关爱保护工作，维护未成年人合法权益是各级政府的重要职责，也是家庭、学校和全社会的共同责任。

这体现了对未成年人的保护有（  ）

①家庭保护    ②学校保护    ③社会保护    ④司法保护

Hello, I’m Linda. I have four friends. They are Ann, Lisa, Tom and Peter. Ann lives near school. She comes to school on foot. There is an underground station near Lisa’s home. She comes to school by underground. Tom lives far from school. He comes to school by bus. Peter likes riding. He comes to school by bike.

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①苹果树开花后，喷施适宜浓度的生长素可防止果实脱落 

②用细胞分裂素处理马铃薯块茎，可抑制其发芽 

③用一定浓度乙烯利处理采摘后未成熟的香蕉，可促其成熟 

④用生长素类似物处理二倍体番茄幼苗，可得到多倍体番茄．