把a、b、c、d四块金属片浸在稀硫酸中，用导线两两连接可以组成原_爱下问搜题

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问题选择题

把a、b、c、d四块金属片浸在稀硫酸中，用导线两两连接可以组成原电池，若a、b相连时a为负极；a、c相连时c极上产生大量气泡；b、d相连时b为正极；c、d相连时，电流由d到c．则这四种金属的活动性顺序由大到小为（　　）

A．a＞c＞d＞b

B．a＞b＞c＞d

C．c＞a＞b＞d

D．b＞d＞c＞a

答案

由a、b相连时a为负极得，a的活泼性大于b；

由a、c相连时c极上产生大量气泡得，a的活泼性大于c；

由b、d相连时b为正极得，d的活泼性大于b；

由c、d相连时，电流由d到c得，c的活泼性大于d．

所以金属的活动性顺序由大到小为a＞c＞d＞b

故选A．

完形填空

Mrs. Ball had a son. His name was Mick. She 　26　him very much and as（因为）he was not a 　27　child, she was always afraid that he might 　28　ill. 　29　she usually took him to see the best 　30　 in the town four times a year and asked the doctor to look 　31　the son.
　 During one of these 　32　, the doctor gave Mick all kinds of tests(检查) and then said to him, “Do you have any trouble with your nose or ears ?” Mick 　33　for a second and then answered, “Yes, I 　34 _.”
　 Mrs. Ball was very 　35　. “But I’m sure you have 　36　told me that, Mick!” she said worriedly. “Oh, really?” said the doctor 　37　. “And what trouble do you have 　38　your nose and ears, my boy?” “Well,” answered Mick. “I always have trouble with them when I’m 39　my sweater off, 　40　 the collar (领子) is very tight (紧的).”

A．after　　

翻译题

完成句子。根据汉语意思，完成下列句子，每空填写一个单词。

1. 他比张强年龄大些。
    He is                          Zhang Qiang.
2. 她们准备经常锻炼身体保持健康。
   They are going to exercise more to                          .
3. 你长大后想当什么？
    What are you going to be when you                          ?
4. 上周的才艺表演非常成功。
    Last week's                           was a great success.
5. 你能帮你妈妈做奶昔吗？
    Could you please             your mother              milk shake?

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