单项选择题
A．At the beginning of the 18th century. B．At the beginning of the 19th century. C．At the beginning of the 20th century. D．At the beginning of the 21th century.
A．It’s cheaper. B．It’s convenient. C．It has more goods than the retail shops. D．It’s dangerous to go out for shopping.
A．The problem may have been a very complicated one. B．No one can solve this problem. C．The man thinks that the problem is quite easy for Linda. D．The man thinks that he can solve the problem himself.