用’Yes”或’No” 回答下列问题。（10%）
（1）_____Can trees protect the soil? 
（2）_____Is the surface of the Earth flat?
（3）_______Are there living things on the Earth?
（4）_______Does air have smell?
（5）_______Does the Earth look like a ball?
（6）______Is there water on the surface of the Earth?
（7）_______Does water exert pressure in all directions?
（8）_______Can trees make the air fresh?
（9）_______Is the climate（气候） of the four seasons the same in different parts of the Earth?
（10）_______ Does water exert an upward push on all objects in the water.