如图，下列叙述可由“世界人口增长曲线图”中分析得出的是（　　）

阅读理解，根据短文选择正确的一项

    One day a policeman was walking in the park. He saw a man there. The man was holding a penguin（领着一个企鹅）. The man said to the policeman, “ I found this penguin this morning. What shall I do with it?”“Take it to the zoo,” said the policeman. The next day the policeman saw the man again. He was still holding the penguin. The policeman said, “Why didn't you take the penguin to the zoo?”“I did,” said the man. “I took him to the zoo yesterday. Today I'm taking him to the cinema.

下列现象中，能用分子热运动知识来解释的是(   )

下列是对鉴真和玄奘的叙述，其中错误的是（    ）

配制50g质量分数为10%的氢氧化钠溶液，下列失误会导致所配溶液溶质质量分数偏大的是____ ．

A．装瓶时，有溶液洒出  B．将量筒中的水倒入烧杯时有水溅出  C．溶解时未用玻璃棒搅拌  D．____．