题目内容：
Questionsare based on the following passage.It seems you always forget--your reading glasses when you are rushing to work, your coat when you are going to the cleaners, your credit card when you are shopping...
Such absent-mindedness may be 47 to you; now British and German scientists are developing memory glasses that record everything the 48 sees.
The glasses can play back memories later to help the wearer remember things they have forgotten such as where they left their keys. And the glasses also 49 the user to "label" items so that information can be used later on. The wearer could walk
around an office or a factory identifying certain 50 by pointing at them. Objects indicated are then given a 51 label on a screen inside the glasses that the user then fills in.
It could be used in 52 plants by mechanics looking to identify machine parts or by electricians wiring a 53 device.
A spokesman for the project said: "A car mechanic 'for 54 could find at a glanbe where a part on a certain car model is so that it can be identified and repaired. For the motorist the system could 55 accident black spots or dangers on the road."
In other cases the glasses could be worn by people going on a guided tour, 56 points of interest or by people looking at panoramas where all the sites could be identified.
注意：此部分试题请在答题卡2上作答。
请作答（47）______
参考答案：
答案解析：