---t’s a challenge, I guess, man against nature.
| A．of | B．for | C．by | D．about |
everybody enjoys fresh cut flowers around his house．few people know how to keep them for as long as possible．
| A．Because | B．Since | C．While | D．If |
Polar bears liveon sea ice，which they use as a platform for hunting seals
| A．most | B．almost | C．nearly | D．mostly |
Every family in America has had this sort of experiencethere was a price increase of nearly one-third in the past two years
| A．that | B．which | C．what | D．when |
About 85％of the Australian population of 20millionin the six major cities around the coast nowadays
| A．has lived | B．live | C．1ivcd | D．1iving |
Platypus is a strange animal that lays eggs butmilkits young．
| A．feeds；to | B．feeds；for | C．fed；at | D．fed；on |