1. [单选题]下列说正确的是
A. 形成离子键的阴阳离子间只存在静电吸引力
B. HF、HCl、HBr、HI的热稳定性和还原性均依次减弱
C. 第三周期非金属元素(nonmetal elements)含氧酸的酸性从左到右(from left to right)依次增强
D. 元素周期律是元素原子核外电子排布周期性变化的结果
2. [单选题]--My mother is preparing my favorite dishes, Go with me and have a taste, okay?--_______. And I’ll be glad to meet your parents.
A. I think so
B. I’d love to
C. I’m sure
D. I hope so
