短文改错（共10小题；每小题1分，满分10分）

文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1、每处错误及其修改均仅限一词；

2、只允许修改10处，多者（从第11处起）不计分。

At 7:30 on the morning, we gathered at the school gate and set off on a large bus．An hour later, we arrive at the Forest Park．Getting off, we started our journey at once.

First, we climbed the green hills and on the way tried their luck to hunt for hidden treasure．Next, we toured around the lake in the comfortable boat．The beautiful scenery was really a feast for the eye．Then at noon time, we landed and settled at an open area, which we enjoyed a wonderful picnic．After eating, we sang and danced happy and played some interesting games．The day passed quickly．Finally it was time for us to return back．So at 3:00 pm, we cleaned the ground, made our way to the parking lot, getting on the bus and left.

It was really an exciting trip since we had long busy with our school work.

下列说法中不正确的是（　　）

A．重核裂变时应该吸收大量的能量

B．许多元素能自发地放出射线，使人们开始认识到原子核是有复杂结构的

C．卢瑟福在α粒子散射实验中发现了电子

D．γ射线一般伴随着α或β射线产生，它的穿透能力最强