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问题 填空题

我国现存比较完整的宫殿有三处，分别是______、______和布达拉宫。

答案

参考答案：北京故宫 沈阳故宫

填空题
用框中适当的短语完成句子。
hardly ever   How ofen    every day    as for    surf the internet     try to   look after  
help...do    the same...as   get good grades
1. Lucy and Lily are twins; Lily has _____ lifestyle _____ Lucy.
2. My sister is always ill, she _____ does exercise.
3. My parents went to work, so I had to _____ myself.
4. — _____ do you exercise?
    —Once a week.
5. If I study hard, I believe (相信) I can _____.
6. The young (年轻人) should _____ the old _____ some cleaning.
7. I am a student; I should do my homework _____.
8. I want to play basketball, _____ homework, I will finish it later.
9. It is time for computer, everyone wants to _____.
10. I _____ do my homework.

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选择题

现有下列短周期元素的数据

元素性质\元素编号①②③④⑤⑥⑦⑧
原子半径0.741.601.521.100.991.860.750.82
最高化合价+2+1+5+7+1+5+3
最低化合价-2-3-1-3
下列说法中，正确的是（　　）

A．元素原子序数④小于⑦

B．②、③号元素处于同一周期

C．⑤号元素最高价氧化物的水化物酸性最强

D．⑧号元素是金属元素
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