问题
选择题
Studies show that Americans chat on their phones for more than five hours a month, _____ Europeans.
A．as much as twice
B．twice as much as
C．as much twice as
D．as twice much as
答案
答案：B
考查倍数表达法。倍数表达法：倍数+as adj n as ；倍数永远放在最前面。可知B正确。
="2" m/s的恒定速度向右运动，要让该演员滑下后能留在车上，则车启动后演员应在多长时间范围内开始下滑？（把人看作质点，人与车之间动摩擦系数μ=0.2， g取10m/s2）