单项选择题

The accident drew renewed attention to the popular but (1) A320. It was the first plane Airbus designed using highly computerized systems that are (2) to curb pilot error and allow crews to land (3) autopilot. Now (4) all Airbus planes—from the A320 to the jumbo A340—operate on a " fly by wire" system, which uses electrical impulses (5) cables and pulleys to move the control (6) on the plane’s wings. (7) into the plane’s software also is a protective "envelope" that limits (8) steeply a pilot can climb, dive or band the aircraft.
Still, Airbus has a relatively good safety (9) with A320. Last week’s crash was the seventh accident—the fifth resulting in (10) —involving A320 since its (11) in 1987. But some of those accidents have raised the question of whether the aircraft’s computer system may be too complicated. Several of the crashes resulted from pilot’s making errors in (12) the plane’s computerized control or (13) devices. In one (14) 1992 crash near Strassbourg airport, French investigators concluded that an Air Inter plane flew (15) a mountain several miles (16) the runway because the pilots had incorrectly (17) the plane’s descent rate into the computer. The cockpit voice recorder showed that up till the moment of (18) , the pilots had no idea of their mistake. (19) , investigators say, such incidents indicate that Airbus may need to add or (20) warning devices that tell the pilots when they are dangerously close to the ground.

Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on ANSWER SHEET 1.20（）

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