任何单位、个人都应当（）为报警提供便利，（）阻拦报警。A、无偿，不得B、收费，不得C

现代市场经济是由政府干预经济还是由市场自行调节

阅读下面短文，根据短文内容用方框内所给词汇或短语的适当形式填空，使短文意思完整。（温馨提示；一定要注意词语的形式变化！）

The other day, my friends and I talked about the rules we have in school. At our school, we have to wear   小题1:   every day. The   小题2: is that all my classmates think the uniforms are    小题3:  .We think young people should look smart and we would like to wear our own clothes. Our 小题4:    believe that if we did that, we would concentrate more on our clothes than our studies. We disagree. We would小题5:  more comfortable and that is good for studying. If we can’t do that, we should be allowed to design our own uniforms. That would be a good way to keep 小题6: teachers and students happy.

It’s also probably a good idea for parents to  小题7:  teenagers to study in groups during the evening. I know we get noisy sometimes, but we learn a lot   小题8:  each other. We also think that vacations should be小题9:.At present they’re too short. Longer vacations would give us time to do things like volunteering. Last summer I小题10:  an opportunity to volunteer at the local hospital, but I couldn’t  because I had to go back to school. It would be a good experience for me because I want to be a doctor when I’m older.

方方家住在6楼，每两层楼之间有15级台阶，她从1楼到家，一共要走______级台阶．

如因故需要在坡道上停车，要尽可能选择路面较宽且两边视线较远的地方，停车时要（）以防车辆溜滑。

A、拉紧手制动

B、将车轮专项安全的方向

C、将变速箱挂入空挡

D、用三角木或用石块将车轮掩住

网上定价发行申购期内，投资者按委托买入股票的方式，以发行价格填写委托单，认购完成前可以撤单。( )