1 . A

Water had also appeared on other planets like Mars but,     1     the earth, it     2     later. It was not immediately obvious that water was to be     3     to the development of life.     4     many scientists believe is that the continued presence of water allowed the earth to dissolve     5     gases and acids into the oceans and seas.

B

Some people have the idea that you can cross Canada in less than five days, but they forget     6     Canada is 5,500 kilometres from coast to coast. Here in Vancouver, you’re in Canada’s warmest part. People say it is Canada’s most beautiful city,     7     by mountains and the Pacific Ocean. Skiing in the Rocky mountains and sailing in the harbor make Vancouver one of Canada’s most popular cities     8     in. Its population is increasing rapidly. The coast north of Vancouver has some of the oldest and most beautiful forests in the world. It is so wet there that the trees are     9     tall, some     10     over 90 metres.

2 . Canada is a multicultural country, with a large size but a small     1    . And it is s    2     by water on three sides. Most Canadians live within 320 kms of the USA     3    . Many people have the idea that they can cross the     4    (大陆) in less than five days , but they are wrong.

Canada has rich     5    (自然) resources, such as wood, fresh water and minerals. The trees are extremely tall, some     6     over 90 meters. When you cross the Rocky Mountain, you may     7     sight of some mountain goats and even a grizzly bear and an eagle. If you’re     8     enough to meet the Calgary Stampede, you’ll see many wild animals and many cowboys, who have a g    9     for working with animals, from all over North America. Of course, if you go to Canada, you can’t miss the Lawrence River and the most     10    (富有的) and biggest city, Toronto.