通常情况下，连续测深辨位的准确性主要取决于（）。A.测深的准确性 B.潮高改正的准

阅读短文，从方框中选择适当的词并用其正确形式填空，使短文意思通顺、完整。请将答案写在短文后相应题号的横线上。每空限填一词，每词限用一次。方框中有两个词是多余的。

they  surprise  he  other  no  what  easy  hard  prepare  toy  do     allow

There are two twin brothers in a family .One was an optimist and the  小题1: was a pessimist. The parents were worried about  小题2: behavior and attitude, and finally took the boys to see a psychologist( 心理学家).
The psychologist looked over them for a while ,and then he said， “They can     小题3:  be helped.”  He told the parents to prepare a room filled with all the   小题4:   that a boy could want .They should put the pessimist boy in that room and   小题5:   him to enjoy life. They also needed to    小题6: another room and fill it with horse manure(马粪). They should put the optimist boy in that room. They      小题7: this, and then watched both boys through one-way mirrors.
The pessimist continued to be a pessimist. He said that he had    小题8: one to play with.
They went to look at the optimist, and were  小题9:  to see him digging through the manure.
The psychologist ran into the room and asked   小题10: the boy was doing. He looked up through the manure and said， “I am sure there must be a horse in the room somewhere.”