在“三宝”、“四口”防护检查评分表中，预留洞口、坑井防护每一处无防护措施扣( )。
A．3分B．5分C．6分D．7分
参考答案：D
请你用所给动词的适当形式填空。
小题1:My parents and I _______________ (go) on vacation tomorrow.
小题2:Last weekend our class _______________ (have) fun camping.
小题3:Lisa and Laura _______________ (take) guitar lessons next year.
小题4:Every morning he _______________ (go) to school at around six thirty.
小题5:Finally, _______________ (add) a little salt and pepper in the vegetable soup.
静止在水平桌面上的一本书，书受到______力和______力的作用，前者的施力物体是______，后者的施力物体是______．
