小题1:C
小题2:D
小题3:B
小题4:A
小题1:推理判断题。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。
小题2:细节理解题。结合The population of Australia is nearly as large as that of Shanghai可知答案。
小题3: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B则说它是澳大利亚最大的城市，所以B项错误。
小题4:词义理解题。结合下文There we saw large numbers of wild flowers on show可知答案。