3.在分解太陽光時,使太陽光照射在 上,并折射到 色的墻壁上,便會出現(xiàn)一條彩色的光帶.夏天大雨過后,天空中有時也會出現(xiàn)這樣的光帶(即彩虹),這種現(xiàn)象的形成是由于 .(填“人眼的幻覺”或“光的色 散”)
知識點二 色光的混合
2.(2005年·常州市)天地萬物,五光十色.關(guān)于光,下列說法錯誤的是 ( )
A.太陽光是由多種色光組成的 B.可通過三棱鏡使太陽光發(fā)生色散
C.光是一種電磁波 D.白光是單色的光
1.小明學(xué)了光的色散之后,小明想回家再做一下這個實驗,但家里沒有三棱鏡,下列器材可代替三棱鏡的是 ( )
A.玻璃磚 B.一盆水和平面鏡 C.凹面鏡 D.凸面鏡
15、---- I go back before lunch?
----No,I don’t think you .
A、Need;must B、Do;need to C、Must;have to D、May;ought to
1-----5ADCAB 6----10CDCBA 11---15ABBCC
14、----Why didn’t come to my party?I was so disappointed at your absence.
----I’m very sorry.I but I had a visitor at the last minute.
A、would like have B、would like to C、would like to have D、would like
13、Johnny,you play with the knife,you hurt youtself.
A、won’t;can’t B、mustn’t;may C、shouldn’t;must D、can’t;shouldn’t
12、The taxi only hold six passengers.It is full.You take the next one.
A、may;may B、can;may C、may;can D、must;can
11、I wish to go home now, I?
A、may B、can’t C、must D、do
10、Sorry,I’m late.I have turned off the alarm clock and gone back to sleep again.
A、might B、should C、can D、will
9、----He seems to be a student.
----No,he .
A、used to B、used to be C、used to have D、used to have been
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