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| The world 1 many interesting sounds. Some are unpleasant to our ears while 2 are very pleasant to hear. In a single day you probably hear 3 sounds. All sounds are different. Some 4 loud, some sounds are high, others are low, some sounds are useful. 5 sound we can not talk or listen to each other. The ringing of the alarm clock wakes people up; the hooting of a car warns people of danger. Some sounds are harmful. When planes fly low 6 the land. The very loud sounds can damage the house. Very loud sound can even make people deaf. We know sound travels about one kilometer in three 7 . In a thunder storm you see the lighting first and then hear the thunder. This is because light travels_8_ than sound. Next time you see lightning, count the number of seconds before you hear the thunder. Divide this number 9 3. This will tell you 10 kilometers away the thunder storm is.
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| Australia has a lot of lovely animals. The most famous ones are kangaroos and koalas. The kangaroo is the symbol of Australia. They have large eyes and ears. They don't walk, they jump. They use their strong back legs. They can jump at up to 74 kilometres per hour. They can go over nine metres in one jump! Kangaroo mothers have pouches (育儿袋) to carry their babies. The babies stay inside to get milk and keep warm. Kangaroos are everywhere in Australia. They are on TV, in books and in the shops. The government even wants to put them on passports (护照). There are about 20 to 25 million kangaroos in Australia. That's more than the number of people in the country! Some kangaroos go hungry because there is not enough to eat. They break into farms for food. Farmers are very angry with them. To help the farmers, the Australian Government kills some kangaroos each year. The koala is another famous Australian animal. They look like bears, and have small eyes and big noses. They eat leaves from gum trees, where they spend most of their time. Koalas have a special smell. They use it to mark (标识) their home -"this is my place, you can't come in!" Like kangaroos, a koala baby lives in its mother's pouch. But koalas have fewer places to live. There are about 100,000 koalas in Australia. There is a law to keep them safe. | |||||||||||||||
根据文章所提供的袋鼠和考拉的生活状况，用简洁的句子完成下列表格：
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