2011½ì¸ß¿¼Ó¢ÓïµÚÒ»ÂÖ×ÛºÏÆÀ¹À¼ì²âÊÔÌâ4
µÚÒ»½Ú¡¡Óï·¨ºÍ´Ê»ã֪ʶ(¹²15СÌ⣻ÿСÌâ1·Ö£¬Âú·Ö15·Ö)
21£®Special attention should be paid________our earth from________.
A£®to prevent£»being polluted¡¡¡¡ B£®to prevent£»polluting
C£®to preventing£»being polluted D£®to preventing£»polluted