根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
Do you know Australia? Australia is the largest island in the world. It is a little smaller than China. It is in the south of the earth. _____The population of Australia is nearly as large as that of Shanghai. The cities in Australia have got little air or water pollution. ___ You can clearly see fish swimming in the rivers. Plants grow very well.
Last month we visited Perth, the biggest city in Western Australia, and went to a wild flowers’ exhibition. There we saw a large number of wild flowers we had never seen before. We had a wonderful time. ______ In spring every year Perth has the wild flowers’ exhibition.
After visiting Perth, we spent the day in the countryside. We sat down and had a rest near a path at the foot of a hill. ____ Suddenly we heard bells ringing at the top of the hill. What we saw made us pick up all our things and run back to the car as quickly as we could. There were about three hundred sheep coming towards us down the path.  ______ After a short drive from any town, you will find yourself in the middle of white sheep. Sheep, sheep, everywhere are sheep.

A．The people of Australia are very hard-working.

B．Australia is the sixth largest country in the world.

C．Australia is famous for its sheep and kangaroos.

D．Australia is big, but its population is not large.

E.  Perth is famous for its beautiful wild flowers.
F. The sky is blue and the water is clean.
G. It was quiet and we enjoyed ourselves.