英语专业八级改错练习题及答案解析(八十七)

文章作者 100test 发表时间 2008:01:25 14:34:43
来源 100Test.Com百考试题网

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 devices 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., are
now 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