[单选题]
Glasses protect people's eyes from bright light. Microscopes make tiny things larger ( 1 ) we can examine them. Telescopes make objects that are far away appear ( 2 ) closer to us. However in recent years plastics have replaced glass ( 3 ) conditions where glass might be easily broken there are new uses to be developed for glass that were never imagined in the ( 4 ) . Perhaps the greatest ( 5 ) of glass is that its constituent (构成的).parts are inexpensive and can be found all over the world.
4. ____
A.much
B.so that
C.advantage
D.past
E. on
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