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The gap between 2 1. molecules is smaller than that of liquid.

22. Alcohol machine swimming can be dissolved in kerosene, alcohol and other organic substances, but it is insoluble in water and is an inorganic substance.

23. Mountain and plain craters

24.88 Ursa Major

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26. Wipe with a cloth and rinse with plenty of water.

27.⑤ ①④

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29.abdfg breastfeeding

30. Epidermal tissue, muscle tissue, capillary tissue and tissue are specific.

3 1. (I can't see your box) From small to large-earth-moon system, the sun.

Galaxy, galaxy, the whole galaxy.

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