()向轻质、高强、多功能化发展。
A、工程材料;
B、土木工程;
C、技术;
D、设计。
参考答案:A
11,13,14,38,65,()。
A.73
B.92
C.103
D.117
People tend to live more happily and longer if they are ________ about life.
A.pessimistic
B.enthusiastic
C.optimistic
D.terrific