One of the most famous bridges in the world is the Golden Gate Bridge that spans San Francisco Bay. Because it was built in 1937, it has become one of the first sights people see if they are coming to San Francisco by ship. The main part of the Golden Gate Bridge is a suspension span. It hangs from steel cables that are supported by two huge towers, one at each end of the bridge. The suspension span was the longest in the world when it was finished in 1937. It measures 4 200 feet between the towers. The Boor of the bridge is wide enough for six lanes of cars, three in each direction. There are sidewalks, too, but not many people use them. It costs a lot of time to go on foot from one end of the bridge to the other.
The years since 1950 have been called the era of the giant bridges. Most of them have been built in the United States. The Mackinac Bridge in upper Michigan was finished in 1958. It is a suspension bridge, with foundations resting on rocks 200 feet below the su
One of the most famous scientists to study adaptations (适应能力) was Charles Darwin (达尔文). He was born in England in 1809. He wasn’t the best student in his school, but when he was 16, his father sent him to a medical school. Charles liked spending time outdoors observing (观察) nature more than attending medical classes. He dropped out without graduating.
Next, Charles’ father sent him to school to become a minister (牧师). This time he made it to graduation. But he didn’t want to do the work of a minister. His friends encouraged him to follow his interest in science.
After graduation, Charles was invited to sail on the Beagle as an unpaid scientist. He wasn’t the first choice, but he was the lucky one to go. The Beagle was to travel to South America and then around the world. The crew’s task was to make maps of the places they visited.
On December 27th, 1831, Charles Darwin sailed from England on the Beagle. The trip was planned to
A. attending medical classes
B. the work of a minister
C. sailing around the world
D. science
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