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About seventy percent of our earth _______ by water.
A. is covering B. is covered
C. are covered D. are covering
B ¡¾½âÎö¡¿ÊÔÌâ·ÖÎö£º¾äÒ⣺µØÇòÉÏ´óÔ¼°Ù·ÖÖ®ÆßÊ®±»Ë®¸²¸Ç¡£´ËÌ⿼²éÖ÷νһÖ£¬µØÇòΪһ¸öÕûÌ壬°Ù·ÖÊýµÄνÓï¸úËüËùÐÞÊεÄÃû´Ê£¬ËùÒÔΪµ¥Êý£»be covered with±»¸²¸Ç¡£¸ù¾Ý¾äÒ⣬ӦѡB¡£
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