单项选择题
A．They were drawing pictures. B．They were watching TV. C．They were making a telephone call. D．They were tidying up the drawing room.
A．To determine whether the Earth’s temperature is going up. B．To study the behavior of some sea animals. C．To measure the depths of the ocean. D．To measure the movement of waves on the ocean.
A．Mr. Smith will be replaced if he makes another mistake. B．Mr. Smith is an admirable chief of the Asian Department. C．Mr. Smith’s department is more successful than all the others. D．Mr. Smith is seldom in his office.