【判断题】黄河全长6300千米,最后注入渤海。 [ ]
【单选题】— How many foreigners come to China every year? — It's hard to say. ______people,I think.
【单选题】Many students have never been to China before and ______ any Chinese. [ ]
【单选题】( )为恒山景观之最,明代大旅行家徐霞客称它为“天下巨观”。
【判断题】黄河全长6300千米,注入渤海。 [ ]
【简答题】嫁接成活的生理基础是植物的 能力和 能力。嫁接成活的关键是接穗和砧木二者 的紧密接合,其接合面愈大,愈易成活。
【简答题】黄河全长6300千米,注入渤海______.