Read the passage. Circle the best answer A, B, or C lớn each of the questions.
If you are a big người hâm mộ of Doraemon, a Japanese cartoon series, you will realise that there are some magic gadgets that can transport people from one place lớn another in a super modern way. They are imaginary products that reflect people’s desire lớn invent future means of transport. One of the most popular ones is the bamboo-copter. It has a semi spherical base connected with spinning rooters by a thin shaft. Just putting it on any part of the body toàn thân, Doraemon and his friends can fly anywhere they want by just thinking. It looks small but can carry a heavy body toàn thân. Although it runs on batteries, it doesn’t pollute the environment. However, sometimes users can have a big problem if the battery is flat, especially when they cross a vast ocean or desert.
What is the passage mainly about?