若y=2x+1，当x（ ）时，y<x。
<-1
I told Mom that not everyone could manage to have 3 meals on time everyday, ________？
A．could he
B．didn't I
C．didn't she
D．could they
按轮碾法成型试件，试件放置时间不得少于（）
A.6
B.12
C.24
D.48
