单项选择题A.To introduce someone who has researched blushing.B.To illustrate the benefit of a public-speaking glass.C.To give an example of someone who blushes easily.D.To explain a way to overcome blushing.
单项选择题A.Walking on the Moon is just like on Mars.B.The Moon gravity offers more traction and Stability.C.The divers need more oxygen at Martian gravity.D.Walking on Mars will be relatively easier.