单项选择题

What distinguished Dr. Jeol Hiderbrand from others as early as in high school

A．He was given the key to the chemistry lab.
B．His discovery of the correct formula for some chemical compound.
C．He learned more chemistry from his teacher.
D．His excellent score in chemistry learning.

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单项选择题

According to Dr. Jeol Hiderbrand what accounts for his ageless energy

A．His ancestors.
B．His parents.
C．Heredity.
D．Hard working.

单项选择题

The use of helium for deep-sea diving

A．helped to overcome the physical discomforts the divers experienced when nitrogen was used.
B．was found by Dr. Jeol Hiderbrand.
C．is still universally acknowledged as standard practice up to now.
D．all that is included in A, B, and C.