9. The air temperature drops to 18°C. What should you wear? A. thick clothes B. thin clothes C. new clothes D. all of the above 10. Which is true about weather condition? A. Weather condition helps us decide the kind of activities we will do for the day. B. Weather condition does not warn us to be safe from dangers during calamities. C. Weather condition is a steady sky condition and does not affect people's activities. D. Weather condition is not an important factor in determining different types of weather.


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