英语专业八级改错练习题及答案解析45
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., 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