考博英语 改错模拟练习题及答案解析（45）
考博英语考试中有些院校的考博题型中有改错这项，考博英语改错题型需要同学们运用语法、修辞、结构等知识识别短文内的语病并作出改正，很考验考生的语法能力，旭晨教育考博频道整理了考博英语改错模拟练习题及答案解析系列文章供考生们参考练习。
Since 1965, when is equipment became operational, a device called Eros has been helped to make sky traffic__1__safe. Eros is short for Eliminate Range Zero System−range zero meaning collision. Basically Eros is a computer system measures, with great speed and precision, closing__2__speed ( the speed at which two objects are approaching each other ) and range ( the distance apart of the objects ).Eros can warn aircraft approachable each other at jet__3__speeds and can provide protection for as many as a thousand aircraft in wide area. The pilot of an Eros−equipped aircraft heading for a collision hear a warning noise in his ear−phones__4_when his airborne computer calculates that he is within thirty
seconds or half a mile ( whichever occurs first ) of other aircraft.__5__At the same time, a flashing red arrow on the device's indicator panel instructs him to climb. Simultaneously, in the other aircraft, __6__the signal is automatically reversed: the flashing arrow tells the pilot to climb. The newer Eros II system can accommodate a total of two thousands aircraft at one time within a 140−mile radius__7__Every three seconds, each Eros−equipped plane automatically reports to ground stations and to similarly equipped aircraft their precise range, altitude and approach rate. The producers__8__of Eros, the McDonnell Dougals Corporation in the U.S., arenow studying the fitting of Eros and will do more to make__9__the sky safer: they shall also lighten the work of air−traffic__10__controllers and increase the efficiency of airports.
答案：
1. helped—helping
现在完成进行时
2. measures前加that/which
that/which引导定语从句，修饰先行词a computer system
3. approachable—approaching
approaching为现在分词，修饰aircraft，相当于that/which
are approaching each other
4.hear—hears
其主语是the polit
5. other—another
相对于上提到的an Eros−equipped aircraft， 此处为另一架飞机
6. climb—descend
根据上下文的意义，一架飞机下降，另一架飞机上升，以免相撞
7.thousands—thousand
根据语法规则，数词hundred 、thousand 、million等词一般为单数形式
8. their—its
指上文中的主语each equipped plane
9. 去掉make前的to
do与make并列作动词谓语
10. shall—will
表示一般将来，shall常用于第一人称，will则常用于第二和第三人称
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