阅读短文，选择正确答案。
Uncle Li and Uncle Wang are good friends. They live next to each other and their farms are both at the foot
of the mountain. So they can help each other. But neither of them likes to use his head. They're both poor though
they work hard. Most villagers have built new houses, but they still live in the low and broken houses. They
never find out why.
Once Uncle Li went to town to buy some medicine for his wife. In the town he heard the apples in a city
were expensive. He told Uncle Wang about it as soon as he went back. They decided to carry some apples to
the city. They borrowed some money from their friends and bought nearly 1,000 kilograms of apples in the
villages and carried them to the city on a tractor. Bad luck! A lot of apples has already been carried there when
they arrived. A few days later they had to sell them at a low price (价格). They felt unhappy and returned to
their village.
"I can't understand why we sustained (蒙受) losses in business while others always profit (盈利)" Uncle Li
asked one day.
"The tractor was too small " Uncle Wang said without thinking. "We'll carry more apples on a truck next
time!"
"I agree!" said Uncle Li. "How foolish (傻的) we were!"
1. Uncle Li and Uncle Wang live in the low and broken houses because _______. [ ]
A. they hope to save money
B. they're both poor
C. their farms are at the foot of the mountain
D. they're not far from their farms
2. The two farmers carried the apples to the city to _______. [ ]
A. make a journey
B. visit some places of interest
C. meet their friends
D. make a profit
3. The two farmers had to sell their apples at a low price because _______. [ ]
A. theirs weren't as good as the others'
B. theirs were much less than the others'
C. a lot of apples had been already carried to the city
D. they forgot to carry them on a truck
4. Uncle Li and Uncle Wang were unhappy because _______. [ ]
A. they had sustained losses in business
B. they had lost some money in the city
C. something was wrong with the tractor
D. other people profited in the city
5. Which of the following is true? [ ]
A. The two farmers found out why they were poor.
B. The two farmers will soon get rich.
C. Neither of the farmers is clever.
D. The two farmers decided to buy a truck.
可知c光在玻璃中速度最小，A错B正确.由双缝干涉和全反射知识易知C正确，D错误.