某同学用pH试纸测定日常生活中的一些液体的pH．他的实验记录一定错误的是（ ）
A．肥皂水pH=10
B．纯碱溶液pH=11
C．橘子汁pH=4
D．食醋pH=7
A、肥皂水显碱性，pH大于7，该实验记录合理．
B、纯碱溶液显碱性，pH大于7，该实验记录合理．
C、橘子汁显酸性，pH小于7，该实验记录合理．
D、食醋显酸性，pH应小于7，该实验记录一定错误．
故选D．
| 完形填空。 | ||||
| Rick goes to Boston ___1___ a meeting. The meeting is in Prince's Building on ___2___ Street, and Rick wants to be there on time. However, it is Rick's first time to visit the city, ___3___ he doesn't know his way around. When he sees an old couple sitting on a bench, he goes up to ask for ___4___. The couple kindly tell Rick to ___5___ the underground and to get ___6___ at Prince Station. Rick follows their direction, gets off at Prince Station and walks east for two blocks. An hour later, he is disappointed (失望的) to find that he is ___7___ 41st Street, not 44th Street. The ___8___ misheard (听错) him and gave him the ___9___ direction. Another hour later, when a policeman takes him back, he sees the old couple again. They are still ___10___ on the bench, right in front of Prince's Building. | ||||
|