题目

同学们应养成良好的用眼习惯，避免经常在昏暗处看书，否则易导致（   ） A．远视眼      B．近视眼       C．夜盲症       D．沙眼  答案：B解析:略 The light is on in Tom's room. He ________ be at home now. [     ]A. could B. must C. can D. need