问题 探究题

如果你翻动花园、庭院中的花盆或石块,常常会看到一些身体略扁、长椭圆形、灰褐色或黑色的小动物在爬行,这就是鼠妇,又叫潮虫。当你搬开花盆或石块,鼠妇很快就爬走了。这是为什么呢?是因为环境变明亮了吗?某同学对此进行了探究,请你将他探究活动的过程写完整。

(1)提出问题:鼠妇会选择阴暗的环境吗?

(2)作出假设:______________________________________。

(3)制订实施探究方案:在铁盘内放上一层湿土,一侧盖上不透光的纸板,另一侧盖上透明的玻璃板,在铁盘两侧中央处各放5只鼠妇,观察鼠妇的行为。这样,在盒里就形成了_______和_______两种环境。该实验的变量是_____________。如果在铁盘两侧中央各放1只鼠妇是否可以得出准确的结论?_______(填:是、否)为什么?________________________________________。

(4)分析结果,得出结论:该同学对上述实验重复了5次,结果如下表。

环境
第一次
第二次
第三次
第四次
第五次
明亮
0只
1只
2只
0只
2只
阴暗
10只
9只
8只
10只
8只
为了使实验结论更准确,应对上述数据作怎样的处理?_________________________________________。

(5)结论:______对鼠妇的生活有影响,鼠妇喜欢在_______的环境中生活。(6)为什么实验结束后要洗手?_____________________。

答案

(2)鼠妇适于生活在阴暗的环境中,光会影响鼠妇的生活(答案合理即可)

(3)明亮;阴暗;光;否;不可以,鼠妇数量太少,实验结果具有偶然性

(4)计算出5次实验结果中,鼠妇在明亮和阴暗环境中的平均值

(5)光;阴暗

(6)“略”

单项选择题

Aspirin is one of the safest and most effective drugs invented by man. The most popular medicine in the world today, it is an effective pain reliever. Its bad effects are relatively mild. It is also cheap.For millions of people suffering from arthritis, it is the only thing that works. Aspirin, in short, is truly the 20th-century wonder drug. It is also the second largest suicide drug and is the leading cause of poisoning among children. It has side effects that, although relatively mild, are largely unrecognized among users.Although aspirin was first sold by a German company in 1899, it has been around much longer than that. Hippocrates, in ancient Greece, understood the medical value of tree barks and leaves which today are known to contain a chemical found in aspirin. During the 19th century, there was a great deal of experimentation in Europe with this chemical, and it led to the introduction of aspirin. By 1915, aspirin tablets were available in the United States.A small quantity of aspirin relieves pain and inflammation. It also reduces fever by affecting some of the body’’s reactions. Aspirin is very irritating to the stomach lining. The best way is to chew the tablets before swallowing them with water, but few people can stand the bitter taste. Some people suggest crushing the tablets in milk or orange juice.

A good title for this passage would be:________

A.Why Do We Take Aspirin

B.How Do We Take Aspirin

C.Aspirin: The Unknown Side Effects.

D.Aspirin: The Most Popular Medicine.

单项选择题