题目

短文填空 Everyone needs friends. We all like to feel close to someone. We can share (1)s ____ with our friends and turn to them for help when we are in trouble. In a word, it is nice to have a friend to (2)t _______, laugh and do things with. Certainly, sometimes we need to be alone. We don’t always want people around. But we would feel (3)l _______ if we never had a friend.To make (4)f______, you must be friendly. A cheerful person smiles. A smile always makes the others like you. Smile at someone and you are sure to get a smile (5)b______ from him.Try to remember names. It (6)配制10%的氯化钠溶液时，不会引起溶液中氯化钠的质量分数偏小的是A．用量筒量取水时仰视读数 B．配制溶液的烧杯用少量蒸馏水润洗C．氯化钠晶体不纯 D．转移已配好的溶液时，有少量溶液溅出 D 【解析】A、量取液体时仰视，视线低于凹液面和刻度线，因此所读取的数值小于液体的实际体积；结果会造成溶剂水的量偏大而引起质量分数偏小．不符合要求，故不选A； B、用水润洗烧杯时，烧杯壁残留的水使所得溶液中溶剂水的量偏大，造成质量分数偏小．不符合要求，故不选B； C、称取的氯化钠固体不纯，致使溶质质量小于配制所需要的溶质质量，引起质量分数偏小．不符合要求，故不选C； D、已...