16．C　细节理解题。根据第一段第二、三句Australia is the largest island in the world. It is a little smaller than China.可知答案为C。

　　17．B　细节理解题。根据第二段的开头The government has made enough laws to fight pollution.及下文可知答案为B。

　　18．D　细节理解题。由第三段的第一句“…the biggest city in Western Australia”我们可以知道Perth是澳大利亚西部最大的城市，而选项D则说它是澳大利亚最大的城市，所以D项错误。

　　19．D　细节理解题。从最后一段的After a short drive from any town, you will find yourself in the middle of white sheep.可以判断出选项D正确。

　　.One possible version：

　　It was the first time that I had been away home without parents during the May Day. I went on a trip with my class to the zoo in Toronto. We left the hotel where we stayed very early in the morning because we had a long journey. We spent the whole day in the zoo. I could remember seeing whales, bears and some other animals for the first time. I was very excited.

　　At midday, we had our picnic lunch in a park near the zoo. After lunch, we visited the reptile house and saw many kinds of animals. It was fantastic. At 5 o'clock, we got on the bus and drove to the hotel.

　　In conclusion，it was the best trip I have enjoyed.

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