题目

下列各组顺序排列不正确的是                                       A．热稳定性：HCl＞H2S＞PH3             B．原子半径：Na＜Mg＜Al C．酸性强弱：H2SiO3＜H3PO4＜H2SO4        D．碱性强弱：NaOH＞Mg(OH)2＞Al(OH)3 答案：B阅读短文，从方框中选择适当的单词填空（每词限用一次）。western simpler manners customs withoutDifferent countries have different 【1】. Let's have a look at the table 【2】. In China, people use chopsticks to eat and they are supposed to eat 【3】 making a noise. But in Japan, it's polite to make a noise when you are eating noodles or drinking tea, because that means the food is delicious and you thank the meal maker. In【4】 countries, people use knife and fork at table. But American table manners are 【5】 than those in Europe. Western people may use more than one set of knife and fork at dinner.