L on the left and R on the right. First, hold the card about 80 cm away and you see boththe letters. Then close your right eye and look at the letter R only with your left eye.And now, as you move the card slowly towards you, you’ll find the letter L disappearing.But if you move the card nearer to your face, the letter will be seen again. Now do thesame experiment with your left eye closed, you’ll find the letter R disappearing.Why does the letter disappear? It is because there is a blind spot on the eye. When theimage (影像) of the letter falls on the blind spot, it won’t be seen. That is why eitherof the letters disappears.

　　5. The passage mainly (主要) tells us _______.

　　A. how to find the blind spot B. an interesting experiment

　　C. where the blind spot is D. there is blind spot on the eye

　　Passage 2 【答案與解析】這篇科普說明文通過一個(gè)簡(jiǎn)易的小實(shí)驗(yàn)，證實(shí)了人的眼睛里有一個(gè)盲

　　點(diǎn)。當(dāng)外界物體的影像落在盲點(diǎn)上時(shí)，人就看不見該物體了。

　　5.D。通篇考慮短文，可知 D 為最佳答案。這由文首一句及“…It is because there is a blind

　　spot on the eye.”也可得出。

　　歸納概括性題目一般都是閱讀理解的最后那道題，一般只要能看懂文章的主要意思就能判斷出來，每次考試中都會(huì)有一到三道這樣的題目，下面給大家提供兩個(gè)練習(xí)，希望你做過之后能夠掌握方法，每次考試都能將這類題目的分得到。

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