枝上交互生长有两列纵毛的树种是()。
A.毛樱桃
B.杏
C.榆叶梅
D.锦带
参考答案:D
I like playing computer games and chatting ()my friends ()the Internet.
A. to by
B. with on
C. for in
D. about through
在旅游应用上,手段-目的链理论关注旅游目的地或产品服务的具体属性。