单项选择题

The example given in the passage illustrates how ______.

A．pure science operates independently of applied science
B．the applied scientist discovers the basic laws of nature
C．applied science defines all the areas in which basic research is done
D．applied science suggests problems for the basic scientist
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单项选择题
The problem discussed in the second paragraph called for ______.
A．selecting the best hear-resistant metal from existing metals
B．developing a turbine wheel capable of generating hear up to 1, 600 degrees Fahrenheit
C．developing metals and alloys that would withstand terrific temperatures
D．causing the jet engine to operate at higher temperatures
单项选择题
Finer and finer subdivision in the field of science has resulted in ______.
A．greater independence of each science
B．greater interdependence of all the various sciences
C．the eradication of the need for specialists
D．the need for only on classification of scientists
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