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试题答案

本文从以下几个角度介绍。

    1、2024庆阳二中
    2、庆阳市二中2024年高考成绩榜
    3、庆阳市第二中学高考喜报
    4、庆阳二中2024年中考榜
    5、庆阳二中2024年高考成绩单
    6、庆阳二中2024年秋季开学时间
    7、庆阳二中2024高考成绩
    8、庆阳二中2024年中考光荣榜
    9、庆阳二中2024年招生简章
    10、庆阳二中2024年高考喜报

3、庆阳第二中学2024~2025学年度第二学期期中考试高二(5月)数学试题


3、庆阳第二中学2024~2025学年度第二学期期中考试高二(5月)数学试题


(
)14.What does the program do
A.Help kids repair bikes.B.Give away bikes to kids.C.Teach kids to ride.
()15.When are Jim's parents going to Hainan
A.This Monday.
B.Next Monday.
C.Next Sunday.


(2025·天津市·月考试卷)
B
At the moment, it may be difficult to imagine, but many people believe that, by the year 2100, we ll live on the planet—Mars. Our own planet, the earth, is becoming more and more crowded and polluted. Luckily, we can start again and build a better world on Mars. Here is what life could be like.
First of all, transport should be much better. At present, our spaceships are too slow to carry large numbers of people to Mars—it takes months. However, by 2100, the spaceship can travel at half the speed of light. It might take us two or three days to get to Mars!
Secondly, humans need food, water and air. Scientists should be able to develop plants that can be grown on Mars. These plants will produce the food and air that we need. However, can these plants produce water for us There is no answer now.
There is a problem for us to live on Mars. The gravity on Mars is much less than the gravity on earth. This will be dangerous because we could easily jump too high and fly slowly away into space. To prevent this, humans on Mars have to wear special shoes to make themselves heavier.
Life on Mars will be better than that on the earth in many ways. People will have more space. Living in a large building with 10 bedrooms is highly possible. Many people believe that robots will do most of our work, so we have more time for our hobbies.


2、庆阳第二中学2024~2025学年度第二学期期中 高二(5月)数学答案


1、庆阳第二中学2024~2025学年度第二学期期中考试高二(5月)数学答案


2、庆阳第二中学2024~2025学年度第二学期期中考试高二(5月)数学答案


5、庆阳第二中学2024~2025学年度第二学期期中考试高二(5月)数学答案


3、庆阳第二中学2024~2025学年度第二学期期中考试高二(5月)数学试题


2、庆阳第二中学2024~2025学年度第二学期期中考试高二(5月)数学答案


A.A B.B C.C D.D
10.下列实验操作合理的是( )
A.乙醇和乙酸混合物可以通过分液进行分离
B.将实验尾气通过饱和食盐水用于除去尾气中的氯气
C.除去固体混有的少量，用热水溶解、降温结晶、过滤的方法除去
D.将两个石墨电极插入饱和溶液，接通电源后导电，可证明是电解质
11.用乙醇制备乙酸乙酯的反应原理为：，实验装置如图。冰盐浴条件下，在三颈烧瓶中，加入50%硫酸、乙醇，搅拌下逐滴加入溶液，控制反应温度得到绿色乳浊液，用等量水稀释，分液，收集上层清液，纯化，干燥，分馏得到乙酸乙酯。下列有关说法正确的是( )


B、铁丝在氧气中燃烧，最终生成黑色四氧化三铁，这是实验结论，不是实验现象，实验现象为铁丝在氧气中剧烈燃烧，放出热量，火星四溅，生成黑色固体，B错误；
C、红磷在空气中燃烧，产生大量白烟，不是烟雾，并放出大量热量，C错误；
D、硫在氧气中燃烧，发出明亮的蓝紫色火焰，生成刺激性气味气体，在空气点燃发出的是淡蓝色火焰，D错误。
故答案为：A。
【分析】掌握常见物质在氧气和空气中被点燃的实验现象是解答该题的关键。
6．【答案】A
【知识点】微粒观点及模型图的应用；从组成上识别氧化物


3、庆阳第二中学2024~2025学年度第二学期期中考试高二(5月)数学答案