根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。Every time you visit Disney World,there's something new to see. What began in 1971 as the Magic Kingdom now includes the hightech,moviemad Disney and Animal Kingdom. Each time the park expands,so do your chances to spend money. How can you save?As a family guide to Disney World,I've been to the park more than 25 times with my kids,and I've developed a few moneysaving plans. Even if you're visiting for fewer days,it's a deal(
下列叙述中,正确的是
A.R+具有和氖原子相同的电子层结构,则与该离子电子数相同的粒子,至少有四种以上
B.X与X2+是某元素的不同存在状态,其粒子具有相同的电子层数和质子数
C.a、b两种粒子的质子数不同,电子数相同,则两者可能是两种不同的分子或不同的原子
D.非金属元素的原子在化学反应中不一定都失去电子