题目

下列各组的比较说明不正确的是（ ）A.原子半径：Si＞C＞NB.PbO比PbO2稳定C.酸性：H2SiO3＜H2CO3D.氢化物的稳定性：CH4＜SiH4 答案：D解析：同族元素的性质递变：随着原子序数的递增，非金属性逐渐减弱，气态氢化物的稳定性逐渐减弱。—Have you decided ____________ on April 1st?—I will put a piece of paper which says “Hi” on my brother’s back.A．what joke will you play on your brotherB．who you will foolC．what will you put on your brother’s backD．how you will fool others