十四、新语篇 电力电动车CR450 阅读短文，选择正确的答案。（10分）
Choo choo! The world's first steam train(蒸汽机车) ran in the UK in 1825. It went 24 km an hour. Today, China's CR450 high-speed train amazes the world. It runs up to 450 km an hour in tests(测试). This makes it the world's fastest high-speed train.
How can a train run so fast? It must be “thin and strong”, said Chen Can, an engineer(工程师) of the train. To help the train “lose weight(减重)”, engineers use special material(材料), such as Carbon fiber(碳纤维). The material is strong and light. This cuts the train's weight by 10 percent.
Also, engineers give the train's nose a cool new look. Now, CR450's nose is just like an arrow(箭). This way, the train runs through the air more easily.
Over the past 200 years, trains have become faster and faster. Will there be an even faster train one day? Anything is possible!
(
A
)1. Where did the first steam train run in 1825?
A. In the UK. B. In the US. C. In the PRC.
(
B
)2. 跨学科 数学计算 How many times(倍) is CR450 faster than the world's first steam train in tests?
A. About 10 times. B. About 19 times. C. About 50 times.
(
B
)3. Why is CR450 faster than old trains?
①It carries fewer passengers(乘客). ②It uses special material.
③Its nose is thinner and longer.
A. ①② B. ②③ C. ①③
(
C
)4. The train's nose refers to(指代)
.
A. the back of the train B. the centre of the train C. the front of the train
(
B
)5. To make a faster racing bike, an engineer could
according to this passage.
A. make it heavy B. use new material and give it a sharp front C. use old material to make it strong
