问题 解答题

某生物兴趣小组在老师的指导下探究光照对鼠妇生活的影响,请你一起来完成探究的过程.

(1)提出问题:______?

(2)作出假设:______.

(3)制定并实施计划:

a准备好实验材料,在铁盘内铺一层湿土,以横轴中线为界,一侧盖纸板,一侧盖玻璃板,形成______和______两种环境.

b在两侧中央各放入5只鼠妇,静置两分钟后,每分钟统计一次两种环境中的鼠妇数目,统计10次.

(4)得出结论:

a观察的结果:黑暗一端的鼠妇数量比明亮一端的______(多或少).

b得出的结论:______.

答案

(1)由于探究光照是否影响鼠妇生活的实验,所以提出的问题是:光照会影响鼠妇的生活吗?

(2)假设是对提出问题作出肯定或否定的回答.根据提出的问题,可作出假设:鼠妇喜欢阴暗的环境.光对鼠妇生活有影响(或光对鼠妇生活无有影响).

(3)制定并实施计划:

a.由于探究的环境因素是光,所以在设计对照实验时,就要以光照为惟一变量,设置对照组,给鼠妇提供明亮和阴暗两种环境,就设置了以光为变量的对照组.

b.在两侧中央各放入5只鼠妇,静置两分钟后,每分钟统计一次两种环境中的鼠妇数目,统计10次.

(4)根据实验结果,黑暗一端的鼠妇数量比明亮一端的多,可以得出结论:光会影响鼠妇的生活.

故答案为:

(1)光会影响鼠妇的生活吗?

(2)鼠妇喜欢阴暗的环境,光会影响鼠妇的生活

(3)a明亮 阴暗;

(4)多 光会影响鼠妇的生活.

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     A hobby can be almost anything that a person likes to do in his spare time. Hobbyists raise pets, watch
birds, paint pictures, play the piano and grow flowers. 1_____ They collect everything from books to
butterflies and from boxes to stamps.
     People take up hobbies because these activities offer enjoyment, friendship and relaxation. Hobbies help
people relax after a long time of hard work, and provide a balance (平衡) between work and play. Hobbies
offer interesting activities for the old. Some hobbies can make a child grow as a person, develop his interest
and help him learn new skills. 2_____ Doctors have found that hobbies are useful in helping patients (病人)
recover (恢复) from illness. Hobbies give patients who can't move around something to do, and provide
interests that keep them from thinking about themselves. Many hospitals treat (治疗) patients by having them
take up interesting hobbies. 3_____ 
     In early times, most people were too busy making a living to have many hobbies. But some persons who
had spare time did enjoy hobbies. 4_____ People today have more time than ever before for hobbies. Machines
have now reduced much time that people must spend on their jobs. 5_____ Those who have developed hobbies
never need to worry about what to do with their newly-found free time hours.
     Sir William Osler, a famous Canadian doctor expressed the value (价值) of hobbies by saying, "No man is
really happy or safe without a hobby."
A. More people retire at an earlier age than before.
B. Hobbies can also help a patient to keep healthy.
C. The ancient Egyptians played games with balls made of wood.
D. They also go to concerts, climb mountains, go fishing, skate and swim.
E. Anyone, old or young, sick or well, rich or poor, can follow a good hobby,
    in spite of his age, health or money.
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