1.因为光从空气斜射入水时发生了折射现象,眼睛所看到的两条鱼,一条是真的‘,一条是假的,假的在真的上面
2.错,物体在人眼的视网膜上成的是倒立缩小的实像,假如物距小了,像距是会变大的
3.平面镜成像中,要求平面镜要光滑,所以.
4.都有一定的作用.首先平面镜成的虚像是等大等距,或者我们可以说的完全相同的,所以物体的颜色起着关键的作用,但人眼从平面镜另一侧观察所成的像,光透过平面镜,发生了反射折射现象,人言看上去像的颜色也会有所改变
5.可以.因为光路可逆
6.只是像变暗
a.连接作用的词,用在句子的中间部分.作用相当于if that,有时可以忽略
She promised _________ he had enough money she would marry him.
A.that B.if C.that if D.if that
【分析】此题应选 C,其余几项均有可能误选.句子的正常词序为 She promised that she would marry him if he had enough money.由于将条件状语从句 if he had enough money 插入动词 promised 与其宾语从句之间,从而导致许多同学误选.顺便说一句,本来动词 promise 后接宾语从句时,引导宾语从句的 that 是可以省略的,但是按英语习惯,当动词与其宾语从句之间插有其他成分时,引导宾语从句的 that 通常不宜省略,所以此题不宜选B.又如：
She promised that if anyone found her son she would give him a lot of money.她答应要是谁找到她儿子,她会给他一大笔钱.（句子可改为 She promised that she would give him a lot of money if anyone found her son.）
He said that when his wife came back he would leave.他说等他妻子一回来,他就离开.(句子可改写为 He said that he would leave when his wife came back.)
Tell him that if he is at home I’ll come to see him.告诉他,如果他在家,我就去看他.(句子可改写为 Tell him (that) I’ll come to see him if he is at home.)
补充问题：
筷子不会可是太阳会
筷子发光吗?是的
原理和月亮一样
只是光线很小很小