1.62×104的精确度判断正确的是（ ）
A．精确到十分位
B．精确到百位
C．精确到百分位
D．精确到千位
1.62×104的精确到百位．
故选B．
Tom looks ________, for he hardly ever exercises ____ his free time.
A．unhealthy, in
B．unhealthy, on
C．healthy, in
D．healthy, for
Linux桌面系统中的鼠标双击即可激活一个应用，不支持单击激活应用的功能。（）
