为提高地温、防风排涝、防止表土板结、改善通风透气应采取（）耕作措施。
A.作畦
B.起垄
C.中耕
D.耙地
参考答案：B
The teacher stressed again that the students should not _________any important details while retelling the story.
A．bring out
B．let out
C．leave out
D．make out
开机操作时应注意什么？
