制作临时装片时,必须让盖玻片的一边先接触水,然后再轻轻地盖上,其主要目的是()

题型:选择题

问题:

制作临时装片时,必须让盖玻片的一边先接触水,然后再轻轻地盖上,其主要目的是(  )

A.避免盖玻片下面出现气泡

B.防止实验材料移动

C.增强透明度

D.防止水溢出

考点:植物细胞结构和功能观察实验:观察洋葱鳞片叶表皮细胞动物细胞结构和功能观察实验:观察人的口腔上皮细胞
题型:选择题

阅读理解。

     I have many good friends. One is John. He runs very fast. He always says to us  "I can run very, very

fast. "One day a man goes to his house, takes some good things, and runs away. John runs after him and cries

out, "Stop, do you know I can run faster than you?" But the man runs faster. John is angry. He runs very

fast to me. I ask him, "Why you run so fast?" He says, "I want to catch the man." "But where is he?" "He is

behind me, he thinks he is faster than me, but you see I'm faster."

1. John is ______.

A. a boy

B. a runner

C. one of my friends

2. John likes to tell people ______.

A. he can walk fast

B. he can run fast

C. he can catch the ma

3. John is happy because he ______.

A. catches the man

B. run faster than the man

C. walks very fast

4. When his friend sees him, John runs ______.

A. behind the man

B. before the man

C. alone

5. Which is right?

A. The man is right

B. John is wrong

C. John's friend is wrong

题型:选择题

2013年6月11日,搭载着3名航天员的神舟十号飞船在酒泉卫星发射中心成功发射。6月20日,神十航天员成功进行了中国历史上的首次太空授课,全国有6000万名中小学生收看了来自太空的直播,让广大中小学生了解了在失重环境下的简单物理现象,也使得中国成为了世界上第二个成功进行太空授课的国家。上述材料体现的唯物论的道理是

A.联系是普遍的,客观的

B.人能认识和利用规律,为人类造福

C.实践具有社会历史性

D.人民群众是历史的创造者

题型:选择题

林书豪是哈佛大学毕业的高材生,也是一个原本被认为不适合打篮球的华裔孩子。他曾先后被勇士队、火箭队裁掉,2个赛季辗转4支球队,最终于尼克斯队签下无保障合同。林书豪面对挫折时的态度,启示我们    

①人生的道路不会是一帆风顺的,人生难免有挫折  

②面对困难和挫折,只有意志坚强、信念坚定、勇于拼搏、不屈不挠,才能战胜挫折、获得成功  

③培养积极乐观的心态和永不言弃的精神    

④应自己做出选择,做自己的主人[ ]

A.①②③      

B.②③④      

C.①③④      

D.①②④

题型:选择题

尿路造影中常见肾盂、肾盏、输尿管和膀胱扩张、积水,其常见于下列哪些病因()

A.结石

B.肿瘤

C.炎症

D.血块

E.先天性病变

题型:选择题

青皮的主要药理作用()

A、降血糖

B、利胆

C、降血压

D、利尿

E、泻下

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