单项选择题
A. They can live in meadows. B. They can jump high to get food. C. They can live off many different kinds of hosts. D. They can survive without eating for many months.
A. Sort the mail. B. Answer the mail. C. Read the magazines. D. File important information.
A. Noblemen centuries ago did not like traveling. B. Heredity is not the only thing that influences our color. C. Exposure to sunlight is the only thing that determines skin color. D. Having a tan is considered a sign of wealth nowadays in North America.