A:减少细菌病害
B:呼吸作用弱,有机物消耗少
C:促进有机物的积累
D:蒸腾作用弱,水分不流失
若 2x-3y+5+|x+y﹣2|=0,则xy=____
Name
Age
Height
Weight
Sarah
11
1.52 metres
35 kilograms
Liu Yun
13
1.60 meters
41 kilograms
Mike
10
1.65 meters
40 kilograms
参考句型: Sarah is . . . than Liu Yun. Liu Yun is . . . than Mike.