距地面以上的高处作业应系好安全带，并且安全带要做到高挂低用。
参考答案：2米
Although the wind has ________, the rain remains steady, so you still need a raincoat. [ ]
A. turned up
B. gone back
C. died down
D. blown out
Questions 29 and 30Choose TWO letters, A-E.Which TWO of the following points does the tutor warn student’s research work
Questions 29 and 30
TW
A-E
TWO
