每个光合单位中含有几个叶绿素分子。()
A、100—200
B、200—300
C、250—300
参考答案:C
某机关现有工作人员135人,比原来精简了25%,原有工作人员多少?列式是[ ]
A.135×(1+25%)
B.135×(1-25%)
C.135÷25%
D.135÷(1-25%)
—Zhouye used to spend much time _____ the Internet last month. How about now?
—Although he hardly ever surf the Internet, he pays more attention _____ his new mobile phone. [ ]
A. surfing, to
B. on, in
C. surfing, in
D. on, on