单项选择题

It can be inferred that Richard Feynman has been ______ now.

A．dead
B．decent
C．prominent
D．popular
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单项选择题
Scientists created ultra fine films of specialized crystals by means of ______.
A．a scanning probe microscope
B．a nanoscale device
C．a molecular beam epitaxy
D．a super computer
单项选择题
Who proved that Feyman's concept, There's Plenty of Room at the Bottom was right
A．Chad Mirkin at Northwestern University
B．Researchers at Almaden Research Center
C．Scientists manipulating atoms and "spray painting"
D．A professor at the California Institute of Technology
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