单项选择题According to the passage, there are more myths about the common cold than any other human disease because________.

单项选择题The hydra is a kind of ________.

单项选择题Eating too much salt can raise your cholesterol.

单项选择题A．Both Sarah and Tom have been awarded doctoral degrees.B．Tom has arranged to meet his bride Sarah in Hawaii.C．Tom was more excited than Sarah at the wedding.D．A double blessing has descended upon Tom.

单项选择题A．In the 1360s.B．In 1795s.C．In the 1950s.D．In the 1960s.

单项选择题A．School and Education.B．Individuals in the United States.C．Responsibilities as Citizens.D．Tomorrow’’s Decision-makers.

单项选择题A．Other living things change their environment while man doesn’’t.B．Man alters his environment while he is adapted to it, but other living things do not.C．Other living things is not only adapted to their environment but also alters it.D．Man is only adapted to the environment but he doesn’’t alter it.

单项选择题With what topic is the passage mainly concerned

单项选择题A．To help him explain the information to his roommate.B．To help him write a paper.C．To prepare for a test.D．To tell her if the notes are accurate.

单项选择题A．At 10:00.B．At 8:00.C．At 7:30.D．At 8:30.