一带电粒子在电场中仅在电场力作用下，从A点运动到B点，速度随时间变化的图象如图所

增强机体对应激刺激耐受力的是

A．K+外流
B．Ca2+内流和K+外流
C．Na+内流
D．Ca2+缓慢内流
E．Na+和Ca2+内流

全色盲（）。

A.闪光ERG检查a波正常，b波下降

B.闪光ERG检查a波下降，b波正常

C.闪光ERG检查a波b波均下降

D.闪光ERG检查Ops波下降

E.闪光ERG检查视锥细胞反应异常，视杆细胞反应正常

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。如有错误，则按下列情况改正：

删除：把多余的词用斜线(\)划掉。

增加：在缺词处加一个漏字符合(^)，并在起下面写出该加的词。

修改：在错的词下划—横线，并在该词下面写出改正后的词。

注意：1. 每处错误及其修改均仅限一词；

2. 至允许修改10处，多者（从第11处起）不计分。

It is five years now since I graduate from No.3 High

School. Last Saturday, the class that I was on held a

get-together, which took us a long time prepare. It

was indeed not easy to get in the touch with everybody

and set a well time for all of us. We all enjoyed

this precious day greatly, remember the time we spent

together and the people they were familiar with.It was

a pity which some of us were not present as they had

gone abroad for further studies, but they calls back

or sent greeting card from different places.

以下是与高中生物实验有关的内容。

良性循环的农业生态系统能减少环境污染的原因是：一方面因实现（），而减少化肥的用量；另一方面因根据生态系统中生物种群间（）的原理进行生物防治，减少农药的施用。