我国跨经度最多、跨纬度最多的省级行政区分别是( )
A：新疆、甘肃
B：云南、陕西
C：内蒙古、海南
D：西藏、新疆
根据短文内容判断下列句子正误。
Dear Mum，
How are you? I had fun with my cousins last week．On Monday we went to a restaurant．We ate some delicious food．On Tuesday we went to a zoo．We saw many animals．On Wednesday we played ping-pong．On Thursday we stayed at home and watched TV．On Friday we went shopping．I bought a pair of shoes．Tomorrow I'll be back home．
Yours Ann
①食盐中的阳离子____； ②食醋中的有效成份的化学式____；
③能使酚酞溶液显红色的气体____； ④医疗上常用作消毒剂的有机物____．
人口在1亿以上且热带季风气候显著的国家是（ ）
