阅读理解。 Australia is the greatest island in the world. It is a little smaller than China. It is to the south of the equator (赤道). So when it is hot summer in our country, it is cold winter in Australia. Australia is big, but the population(人口) there is thin. The population is the same as that of Shanghai, a city in China. Australia has many, many sheep. After a short drive from any town, you will see sheep around you. You can also find kangaroos. A kangaroo has a 'bag' below its chest. The mother kangaroo keeps its baby in the'bag'. It is very interesting, isn't it? 1. Australia is the greatest island in the world. The word 'island ' may mean '______' A. 国家 B. 城市 C. 山脉 D. 岛屿 2. Australia has the same population as that of ______. A. Shanghai B. China C. Beijing D. Japan 3. When you drive in Australia, you may find ______ here and there. A. sheep B. monkeys C. horses D. elephants 4. From the passage, we may guess a kangaroo is a kind of______. A. sheep B. tree C. bird D. animal 5. When it is summer in Australia, it is______ in America. A. spring B. summer C. autumn D. winter