1)In the first paragraph, the writer says that the nano-spider Als much thicker than a human hair.
& cannot be seen under a microscope.
C was invented by an individual scientist.
D is an extremely small machine,
2. Why does the writer suggest nano-spiders can be classified as robots?
A because they have the features of a robot
B because they can walk
C because they are built with computer chips
D because they are microscopic devices
3. What does this refer to in 1. 307
A the number of steps DNA walkers can manage
B the walking distance a DNA walker can do
Cthe length of the DNA walkers
D the time each step takes for a DNA walker
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