推荐回答(2个)
1.米虫从来不喝水,为何不会渴死?
A.本身就不需要.
B.在有氧呼吸过程中产生了大量的水
C.从米中获得
2.鱼儿在一天中的什么时候最容易因缺氧窒息而翻塘?
A.早晨 B.中午 C.傍晚
3. 下列动物尿中尿素含量最高的是( ),为什么?
A. 兔 B. 羊 C. 狼
4. “龙生龙,凤生凤,老鼠的儿子会打洞”说明了生物有什么特征。
A.相似B.遗传C.变异
5. 严重缺氧的病人输氧时,要在纯氧中混入5%的CO2,目的是什么?
A. CO2可维持呼吸中枢的兴奋
B.节约氧气
C.为医院节省开支
6. 为什么新疆的哈密瓜特别的甜?
A.新疆风景好,瓜就自然甜
B.新疆土质含多种矿物质
C.昼夜温差大,有利于有机物的积累
7. 为什么古代宫庭的太监不长胡须,声调较高,声音和动作酷似女人.
A.他喜欢把自己装扮成女人
B. 因无正常的雄激素而丧失了第二性征
C.体内的雌激素增多.
8. 人有时会“触景生情”,这属于生物的何种反射?
A. 条件反射 B.非条件反射 C.神经反射
9. 为什么“大树底下好乘凉”?
A. 蒸腾作用散失大量水分的同时,从而降低了温度
B.树阴大好乘凉
C.光合作用利用光能
10. 刚孵化出的小鸭出壳后会跟着它最先见到物体走.此现象叫什么?
A.趋性 B.模仿 C. 印随
答案:1.B 2.A 3.C 4.B 5.A
6.C 7.B 8.A 9.A 10.C
http://dkgz.ggjy.net/tyys/ShowArticle.asp?ArticleID=233
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