听下面一段较长对话,回答以下小题。
13. What equipment did the speakers need?
A.The string. | B.The compass. | C.The ruler. |
14. What does the man say about the method they used to measure wave speed?
A.It was simple to carry out. | B.It provided accurate results. |
C.It required special equipment. |
15. What mistake did the man make when first drawing the map?
A.He chose the wrong scale. |
B.He stood in the wrong place. |
C.He did at the wrong time. |
16. What will the man do next with their map?
A.Scan it into the report. |
B.Check it with photographs. |
C.Download it from the Internet. |