【正确答案】 D

【答案解析】[解析] operative：运作的。work：运作的。We have many radars operative. 我们有许多雷达在运转着。The old theory doesn't work. 旧的理论已经不灵了。run：经营。She runs a small shop. 她经营着一家小店。move：移动。The earth moves round the sun. 地球绕着太阳转。rotate：转。The earth rotates round the sun. 地球绕着太阳转。