一般讲，催化剂上的积碳达到（）时就需要再生。
A.1-5%
B.5-10%
C.10-15%
D.15-20%
参考答案：C
从东西半球位置看，亚洲大部分地处________半球，从南北半球位置看，亚洲大部分地处________半球。
He said_________ he would visit me and______ he would bring a special present to me.[ ]
A. \, \
B. that, \
C. \, that
D. that, what
