某校初一年级共有三个班，一班与二班人数之和为98，一班与三班人数之和为106，二班与三班人数之和为108，则二班人数为多少人？()
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Parents must observe classes regularly.
A. Right
B. Wrong
C. Not mentioned
某单位有3名职工和6名实习生需要被分配到A、B、C三个地区进行锻炼，每个地区分配1名职工和2名实习生，则不同的分配方案有多少种？()
A. 90
B. 180
C. 270
D. 540
接触网距机车车辆或装载货物的距离不能少于()删。
A. 300
B. 350
C. 400
D. 500
According to Dr. Nicholas A. Christakis, what is the explanation for friends being the greatest influence？
A. Friends usually spend a lot of time together.
B. Friends share similar eating habits.
C. Friends are more important than family members.
D. Friends affected each others' feelings of fatness.
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