荡桨时，领桨手坐在（）。
A、艇尾部
B、艇首部
C、艇中部
参考答案：A
汽车危险货物运输的资质凭证具体包括哪些凭证？
After doing market research, all the researchers think it ________ to invest a large sum of money
in the project.[ ]
A. worthless
B. priceless
C. valuable
D. worthwhile
