发文机关标识简称（）。
A.文头
B.抬头
C.作者
D.落款
参考答案：A
简要分析文化与地理环境的相互关系.
I don't think all this bad language on TV should be allowed; there are certain standards that should be
________.[ ]
A. kept up
B. kept down
C. kept out
D. kept off
