玻璃钢问世于二十世纪四十年代。
参考答案:对
Look! The traffic light is yellow, please ___________.[ ]
A. go
B. stop
C. wait
—How I wish I had studied harder when I was in senior school!
—If you had, you _____ a university student now.[ ]
A. are
B. would be
C. should
D. were