A:葡萄糖在人体内氧化
B:镁条和盐酸反应
C:生石灰和水反应
D:碳和二氧化碳在高温下反应
已知m,n是一元二次方程x2-4x-3=0的两个实数根,则m-2n-2为( ).
The policeman often helps the old woman walk _____________ the bridge.
Yesterday ____ (is) sunny. Jim ____ (go) to the zoo with his friends. They ____ (buy) some ice cream and ____ (see) many animals. They ____ (have) a good time.