A: Hi, Jenny!____ my birthday party on Saturday afternoon?
B: Sure,____.
A:____you, Linda?
C: I'm sorry I can't. I ____ study for a test on weekends.
A: That's too bad. Maybe next time.
C: Sure. Thanks for your ____.
— What were you doing at this time yesterday?
— I _______.
世界上只有一个中国,大陆和台湾同属一个中国,中国的主权和领土完整不容分割。( )
氢氧燃料电池用于航天飞船,电极反应产生的水,经冷凝后可作为航天员的饮用水,其电极反应如下:①2H2+4OH﹣-4e﹣=4H2O,②O2+2H2O+4e﹣=4OH﹣ 当得到1.8L饮用水时,电池内转移的电子数约为( )
漫画《跟不上》反映了农村的落后,农民的贫困制约了工业、城市及整个社会发展空间。农村从根本上改变落后面貌始于( )
下列关于地球形状的描述,错误的是( )