Đọc đoạn văn sau và chọn câu trả lời đùng cho các câu hỏi.  The first real bicycle was made in Scotland. It was built in 1839 by a man named Macmillan. His bicycle had two wheels like a modern bicycle. But it was much difficult to ride. It was heavier

Đọc đoạn văn sau và chọn câu trả lời đùng cho các câu hỏi.  The first real bicycle was made in Scotland. It was built in 1839 by a man named Macmillan. His bicycle had two wheels like a modern bicycle. But it was much difficult to ride. It was heavier because it was made of wood and iron. It did not have rubber tires like a modern bicycle. Instead, it had wooden wheels. This made it very uncomfortable on bumpy roads. But Macmillan was lucky about one thing he could not get a flat tire!  Bicycles are very popular today in many countries. Many people use bicycles for exercise. But exercise is only one of the reasons why bicycles are popular. Another reason is money. Bicycles are not expensive to buy. They do not need gas to make them go They also are easy and cheap to fix. In cities, many people like bicycles better than cars. With a bicycle, they never have to wait in traffic. They also do not have to find a place to park. And finally, bicycles do not cause any pollution!"  21. What does the word "it" refer to?  A. Scotland  B. Macmillan  C. The first real bicycle  D. a modern bicycle  22. What is 22 the best title of the passage?  A. How to make a bicycle?  B. The benefit of bicycles  C. Where to park bicycles?  D. Bicycles in Scotland.  23. Which sentence below is not true according to the passage?  A. Bicycles are not expensive to buy.  B. Bicycles also are easy and cheap to fix.  C. We need gas to make bicycles go  D. Bicycles do not cause any pollution.  24. The word "bumpy" is CLOSEST in meaning to  A. rough  B. smooth  C. soft  D. good