A:36种
B:72种
C:90种
D:144种
Some damage has been caused u____ by people simply walking around the site and some has been caused deliberately.
—She________ to the beach.
下列事件属于中国人民反抗外来侵略的是 ( ) ①虎门销烟 ②淞沪会战 ③辽沈战役④百团大战
把切下的马铃薯带芽块茎种在土壤中,培育成新植株,属于出芽生殖.(判断对错)