下列说法正确的是( )
A:I的原子半径大于Br,HI比HBr的热稳定性强
B:P的非金属性强于Si,H3PO4比H2SiO3的酸性强
C:Al2O3和MgO均可与NaOH溶液反应
D:SO2和SO3混合气体通入Ba(NO3)2溶液可得到BaSO3和BaSO4
设P是△ABC所在平面上一点,且CA→-CP→=CP→-CB→,若△ABC的面积为2,则△PBC面积为( )
读东、西半球图,回答下列问题.
⑴Where's your mum?
⑵Am I going to have a party?
⑶The balloon is flying away.
⑷The teacher can help me.
start:____ duck:____ soon:____
stay:____ mess:____
缩写句子
水里的鱼虾好比是河神的百姓。