請依下文回答第 36 題至第 40 題，並依文意從四個選項中選出最合適者，答案選用不能重覆：    A tsunami is unnoticeable in the open ocean－a long, low wave whose power becomes clear only when itreaches shore and breaks. 36 Spotting the wave while it's still crossing the ocean is tricky, which explainswhy so few of us are aware of the one that's approaching. 37 As it does, it will make the computerrevolution look like small change. It will affect everything from the batteries we use to the pants we wear to theway we treat cancer. The main thing to know about nanotechnology is that it's small. Really small. Nano, aprefix that means "dwarf" in Greek, is shorthand for nanometer, one-billionth of a meter. 38 This comma,for instance, spans about half a million nanometers. To put it another way, a nanometer is the amount a man'sbeard grows in the time it takes him to lift a razor to his face. 39 Tear a piece of aluminum foil into tinystrips, and it will still behave like aluminum－even after the strips have become so small that you need amicroscope to see them. But keep chopping them smaller, and at some point－20 to 30 nanometers, in this case－the pieces can explode. 40 With them, scientists can engineer a cornucopia of exotic new materials, suchas plastic that conducts electricity and coatings that prevent iron from rusting.
36
(A)It's a distance that is so minute that comparing it to anything in the regular world is a bit of a joke. 
(B)Nanotechnology matters because familiar materials begin to develop odd properties when they'renanosize. 
(C)Not all nanosize materials change properties so usefully, but the fact that some do is a boon. 
(D)Technological revolutions travel with the same stealth.