第11题: [单项选择]The country signed a/an ______ contract with America with an aim to make good use of their natural resources and capital. A. residential B. unusual C. influential D. reciprocal 参考答案:D 答案解析:reciprocal互惠的,相互补偿的;residential居住的;unusual不寻常的;influential有影响的。根据题意,答案D正确。