单选题 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

【正确答案】 C

【答案解析】第二段applied scientist发现很多在car中用得很好的金属不能忍耐飞机的高温，后来又指出aircraft designers had to．．．for the development of metals and alloys that would do the job in jet-propelled planes，选项C表述意思符合。