问题 选择题

石榴石是石榴石族矿物的总称,颜色随成分的不同而变化,其组成可以表示为A3B2(SiO4)3,式中A、B均 为金属元素,则A、B对应的化合价依次为[ ]

A.+2,+3

B.+3,+2

C.+2,+2

D.+3,+3

答案

答案:A

阅读理解

根据短文内容,回答下列问题。

     Most people like to eat sweets and ice-cream better than meat and rice. If we eat them after a meal,

they're not bad for us. But if we eat them before a meal, they may take away our appetite (食欲). It is

important for us to eat our meal regularly (有规律地) each day. When we feel worried or excited, we

may not want to eat.

    When a man is worrying about something, it is difficult for him to swallow (香) anything dry because

he has little appetite. Many years ago, some judges (法官) in England often gave a man some dry bread

to judge (判断) whether he was telling the truth. If the man could not swallow the bread, they thought he

was telling lies.

l. If we eat sweets and ice-cream after a meal, are they good for our health?

                                                                

2. If we eat sweets and ice-cream before a meal, what will happen?

                                                                

3. What do you think of the judges in England? Why?

                                                                

4. Do most people like to eat sweets and ice-cream better than meat and rice?

                                                                

5. Is it important for us to eat our meal regularly each day? 

                                                                

填空题