1. Insects are the most diverse and widely distributed animals in the world. (√)

2. Air is an invisible and intangible object, so it does not occupy a certain space. (×) (occupies space)

3. Well water is clear and transparent, a kind of pure water. (×) (Rich in minerals, impurities, not pure water)

4. Every place on the earth has obvious seasonal changes. (× ) (Summer is all year round in the tropics, winter is all year round in the frigid zone, and the Indian peninsula is divided into rainy season and dry season)

5. Objects floating on the water are subject to the buoyancy of the water, while objects sinking in the water are not affected by the buoyancy of the water. of buoyancy. (×) (All objects in the water are subject to buoyancy)

6. People call all animals whose bodies can be divided into three parts: head, thorax, and abdomen. (× )

(Humans also seem to have a head, chest, and abdomen, O(∩_∩)O~)

7. Potatoes are fruits. (× ) (it’s vegetables)

8. The “white gas” that comes out when water boils is water vapor. (×) (Water vapor is an invisible gas, and "white gas" is water vapor liquefied into water droplets scattered in the air)

9. Most of the leaves of plants are green and flat, and most of them are divided into leaves, There are three parts: petiole and vein. (√ )

10. Magnets can attract various metals. (× ) (cannot attract mercury, that is, mercury)

11. Friction will affect the movement of objects, so we must try to reduce friction at all times. (× )

(Many times we deliberately increase friction and take advantage of it, such as the braking system)

12. The environment affects the growth of plants, but plants do not affect the surrounding environment . (× ) (interaction, for example, the water vapor in the woods is heavy and the air is fresh)

13. General objects (including solids, liquids, and gases) have the property of thermal expansion and contraction. (×) (This is difficult to judge, generally yes, there are exceptions, such as water, when it drops to zero and begins to freeze, it does not shrink, but expands in volume)

14. The boiling point of water is at any It's always 100 degrees Celsius. (×) (The boiling point will change under different temperatures and pressures)

15. An external flame must be used to heat objects with an alcohol lamp. (√) (The outer flame temperature is high and the inner flame temperature is low)

16. The inclined plane is also a simple machine. (√ )

17. Leverage must be used with minimum effort. (× ) (Different levers exert force, sometimes saving effort, sometimes laboring)

18. If people’s production activities do not follow ecological laws, they will destroy the ecological balance. (×) (Not necessarily﹚

19. In most parts of my country, southeasterly winds blow in summer and northwesterly winds blow in winter. (√)﹙Just do it﹚

20. Food shortage is the only crisis facing the world today. (×) (not the only one)

21. About 700,000 to 200,000 years ago, a group of primitive humans lived in a cave on Longgu Mountain in Zhoukoudian, West Beijing today. We call them Beijingers. (√)

22. Papermaking, printing, compass and gunpowder are the four great inventions of ancient my country. (√ )

23. On June 3, 1839, Li Zicheng gathered the opium collected on the beach of Humen and destroyed it in public. (×) (should be June 3, 1840)

24. The armillary sphere and the Houfeng seismograph were invented by Li Shizhen.

(×) (invented by Zhang Heng)

25. The Republic of China is located in the east of Asia and on the west coast of the Pacific Ocean. (√ )

26. Lotus roots grow in water and are the roots of plants. (×) (stem of a plant)

27. Sparrows spend the winter in a migratory way. (× ) (Sparrows are migratory birds and do not migrate. Wild geese migrate)

28. Rats and sheep are omnivores. (×) (Sheep are vegetarians)

29. Air guns are made by utilizing the elastic properties of compressed air. (√ ) (Widely used in marine seismic exploration. It uses an air gun to send high-pressure air into the water in a very short moment to form bubbles. The bubbles oscillate alternately with expansion and contraction in the water, causing seismic vibrations.)

30. Oxygen in the air supports combustion. (√)

31. Generally, a north-pointing sign is drawn in the upper left corner of the plan. (√ ) (Actually, the pointing sign I saw is in the lower left corner, so it shouldn’t matter where it is)

32. Chinese characters are currently the most commonly used characters in the world. (√ )

33. my country’s terrain is higher in the east and lower in the west, distributed in a ladder shape. (×) (high in the west and low in the east)

34. The first unified multi-ethnic feudal country in the history of our country was the Qin Dynasty. (√ )