阅读理解。
Li Daiyu and her cousin Liu Qian were on a trip to Canada to visit their cousins on the Atlantic coast.
Rather than take the aeroplane all the way, they decided to fly from China to Vancouver and to take the
train from west to east across Canada in September.The idea that they would cross the whole continent
was exciting.
Their friend, Danny Lin,was waiting for them at the airport. He was going to take them to catch 'The
True North', the cross-Canada train.On the way to the station, he told them, 'You're going to see great
scenery on your trip. Canada is bigger than the United States. It is second biggest country in the world
and as you go eastward, you will see mountains and pass thousands of lakes,forests and wide rivers as
well as cities.The idea that you can cross Canada in less than five days is just wrong. It is 5,500
kilometres from coast to coast.Here in Vancouver,you are in the warmest part of Canada.Many people
think it is the most beautiful city in Canada,as it is surrounded by mountains on the north and east and the
Pacific Ocean on the west.Its population is increasing very rapidly, because the mountain-and-sea city is
a very popular place to live in.Even people from Japan come to settle down here.
That afternoon on the train the cousins settled down in their seats. They crossed the Rocky Mountains
earlier that day and looked out of the windows at the wild scencry.They saw mountain goats and even a
grizzly bear.Their next stop would be Calgary.The Calgary Stampede is a famous Western festival,
Cowboys come from all over North America to compete in riding wild horses.Many of them have a gift
for working with animals and they can win thousands of dollars in prizes.
That night,they slept as the train rushed through the night across the top of Lake Superior.through the
great forests and southward towards Toronto.
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1. How did Li Daiyu and Liu Qian arrive in Canada?
A. They sailed across the Pacific Ocean.
B. They flew to Vancouver.
C. They took a train to Vancouver.
D. They flew to the Atlantic coast.
2. Witch order is right of their train trip?
A. Vancouver Calgary Lake Superior Toronto
B. Toronto Vancouver Calgary Lvake Superior
C. Vancouver Lake Superior Calgary Toronto
D. Lake Superior Vancouver Cvalgary Tvoronto
X与Y独立，由独立乘积概率密度公式得
，即0＜u＜x＜1时，
，否则
，故当0＜u＜1时，令
，则
