— Are there any flowers _______ the tree.— No. But there are many birds _________ it.
A：in, on
B：in, in
C：on, in
D：on, on
下面能体现可持续发展的是（ ）
①国家环保局叫停30家未经审查的污染环境的违法工程
②我国实行严格的保护耕地政策，建立基本农田保护
③国家实行计划生育人口政策
④修筑青藏铁路留有动物通道
J____ from his face on which there was a confident smile, we know that he didn't lose heart.
下列词语中没有错别字的一项是（ ）
