专业英语八级改错练习题及答案解析(19)

Since 1965, when its equipment became operational, a device called Eros has been helped to make sky traffic 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 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 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 earphones when his airborne computer calculates that he is within thirty seconds or half a mile ( whichever occurs first ) of other aircraft. At the same time, a flashing red arrow on the devices indicator panel instructs him to climb. Simultaneously, in the other aircraft, the signal is automatically reversed: the flashing arrow tells the pilot to climb. The newer Eros II system can accommodate a total two thousands aircraft at one time within a 140-mile radius. 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 of Eros, the McDonnell Douglass Corporation in the U.S., are now studying the fitting of Eros and will do more to make the sky safer: they shall also lighten the work of air-traffic controllers and increase the efficiency of airports.

1 ________

2 ________ 3 ________

4 ________ 5 ________

6 ________ 7 ________

8 ________

9 ________ 10 _______

参及解析：

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 pilot。

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。