Question

　　A photograph taken in the Arctic shows a polar bear that is sitting on snow with a paw shading its eyes． But the polar bear, like most mammals, has another protection against the glare of sun shining on snow． Each eye has a third eyelid． These eyelids act as built-in sunglasses．

　　A mammal’s third eyelid is a thin, movable film or membrane． It can spread to cover most of the eyeball． Like the upper and lower eyelids, the membrane can protect the eye from dirt and other harmful materials as well as from too much light．

　　Man's third eyelid has largely disappeared． Its only traces are in the inner corner of the eye． There, a tiny fold of wet skin and a small, pinkish blob are all that remain of this membrane．

1．The first sentence is meant to show that polar bears______．

A．do not like being photographed

B．protect their eyes against bright sunlight

C．are not found in the Antarctic

D．have a third eyelid in each eye

2．Third eyelids act as sunglasses when they______．

A．keep water out of a mammal's eyes　　 B．make objects look smaller

C．make objects look larger D． shade the eyes against glare

3．The membrane forming the third eyelid is______．

A． movable B． thin C．Both A and B　　D．Neither A nor B

4．On a day without sunshine, the membrane would______．

A．spread to cover most of the eyeball　　B． cover very little of the eyeball

C．keep changing in its spreadD． become thicker

5．The story says that the membrane is a protection against______．

A． cold　　B． dirt C． Both A and B　　D．Neither A nor B

6．The only traces of man's third eyelid are found______．

A．below the upper eyelid　　 B．below the lower eyelid

C．in the inner corner of the eye D．in the outer corner of the eye

7．One protection for the eyes that is not named is______．

A． eyelashes B． eyelids　　 C． sunglasses D．None of the above

Answer 1

答案：B;D;C;B;B;C;A
解析：

这里的理解障碍是生词，因此，利用上下文和生活常识猜测词义是完成此题的主要手段。这里有的旧词具备新义，如：film。

提示：

话题：有关“动物眼部进化”语篇的阅读技巧。重点：细节捕捉、词义猜测。