题目

 宏伟的长城是我国古代劳动人民智慧和独创性的象征。下列关于秦长城起止点的叙述，正确的是(      )    A．西起嘉峪关，东到山海关               B．西起咸阳，东至鸭绿江    C．西起临洮，东到辽东                     D．西起长安，东到山海关 答案：CIt’s required that mineral resources_______ hand in hand with the local environment protection.A．be exploitedB．exploitC．have exploitedD．exploited