单项选择题A．They are more convenient.B．Their storage space is more accessible.C．They are more energy-efficient.D．They take up less floor area.

单项选择题A．Five.B．Seven.C．Six.D．Eight.

单项选择题A．Students are less interested in the topics.B．Most courses for senior students are given on a one-to-one basis.C．The size of lecture classes shouldn’t have been that large.D．There are more choices available for students.

单项选择题A．Hiking.B．Swimming.C．Canoeing.D．Camping.

单项选择题A．He’s preparing for a test.B．He lost his notes.C．He missed the class.D．He’s studying this subject.