单项选择题

What distinguished Dr. J. Hildebrand from other students in high school

A．His rich knowledge in chemistry.
B．His discovery of the formula for some chemical compound.
C．His being given the key to the chemistry lab.
D．His strong interest in chemistry from the very childhood.

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单项选择题

The use of helium for deep-sea diving

A．helped to overcome the physical discomforts the divers suffered when nitrogen was used.
B．was found by Dr. J. Hildebrand for deep - sea - diving.
C．is now still generally acknowledged as standard practice for deep- sea diving
D．may be thought to contain all the information stated in A, B, and C

单项选择题

Television in Dr. Hildebrand's eyes is probably

A．a powerful weapon for knowledge spreading.
B．a favorable means to promote learning.
C．something to distract people's attention
D．the embodiment of scientific and technological progress