考博考试

【单选题】It isestimated that a scientific principle has a life expectancy of approximately a decade before it drastically revised or replaced by newer information.
A．estimated
B．a life expectancy
C．decade
D．it drastically
网考网参考答案：D
网考网解析：
[解析] it drastically改为it is drastically，用被动语态。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>