All the visitors live on floor. A. two B. second C. the second
表皮损坏的蕃茄果实很快就会腐烂，这说明表皮是 ( ) A．机械组织 B．营养组织
Andy never wanted to go to bed on time．His parents had explained to him how important it was to go to bed early and get a good rest．But Andy paid no attention to them，and they didn't know wha
公有制为主体、多种所有制经济共同发展，是我国社会主义初级阶段的（ ） A．分配制度 B．经济制度的基础 C．基本经济制度
It’s raining hard. We have to stay at home __________ going fishing. A. in front of B. because of C. in need of D. instead of
给未授粉的番茄雌蕊柱头涂上一定浓度的生长素溶液，可获得无籽番茄。说明了（ ）A．果实发育与受精作用有关 B．果实发育与种子形
In every. country, there are thousands of people who want to help out. Many join organizations run by their governments, for example, the Peace Corps in the United States and Voluntary Service Oversea
（04江苏卷）在植物细胞中，下列过程不需要酶参与的是 A．O2进出细胞
