英语题目.速回答
1.The ___the air is from the ground ,the ___the air is ()
A higher up ;thinner B.lower ;thinner C higher up;denser
2.What gas is give off when an object is burnt ?()
A.Carbon dioxide B. Oxygen C.Hydrogen
3.Which statement is wrong ?()
A.Plants are important to life .B .Animals and man cannot live without plants .
C. Plants can make food only from air and water .