80.902读作（ ），保留整数约是（ ），保留一位小数约是（ ）。
八十点九零二；81；80.9
The services that a freight forwarder renders may often range from routine and basic tasks such as ( ) or customs clearance to a comprehensive package of services．
A．the providing of services
B．the utilizing of services
C．the booking of space
D．the loading and unloading
何谓掺杂？
