题目

温室气体是指CO2、CH4等痕量气体和氟碳化合物等微量气体。 氟元素符号为（） A.Fe               B.F           C. V              D. Fr 答案：BLucy likes playing ________ ping-pong, but her sister Lily likes playing ______ guitar.A.／; ／ B．the; ／C. the; the D.／; the