任务型阅读
阅读下列材料,从所给的六个选项(A、B、C、D、E和F)中选出符合各小题要求的最佳选项，选项中有一项为多余选项。
Directions: Read the following text and choose the most suitable heading from A-F for each
paragraph. There is one extra heading which you do not need.
1._____
The colored part of the eye is called the iris. There are three basic eye colours ─ brown, blue and
green. A few albino people have red or pink eyes, but these are very rare. Many people believe that
blue eyes are more delicate than brown eyes. In fact they are just as tough as brown eyes, although they
are more sensitive to light.
2.______
We only see part of the eyeball, although the whole eye is as big as a table tennis ball. Light enters the eye
through the pupil and passes through the lens. The lens focuses the light onto the retina at the back of the
eye. The retina sends the signal to the brain along the optic nerve. The image on the retina is actually
upside-down, but the brain corrects it. As we get older our eyesight becomes worse. This happens
because the lens isn't as flexible as when we are young and the eye muscles are weaker.
3._____
Our eyes are the most important of our five senses. We receive 80% of our information about the
world through our eyes. We also send signals to other people with our eyes. Some eye signals are
unconscious. When we look at something nice, our pupils get bigger. But when we don't like something,
they become smaller. We cry when we are unhappy and sometimes when we are very happy. But we
can also control some eye signals. For example, we can wink at someone or raise an eyebrow.
Sunglasses make someone appear mysterious or dangerous, because they hide that eyes and so we can't
see the signals.
4._____
We find large eyes more attractive. Children have large eyes in proportion to their heads. Cartoon
characters always have large eyes, too. We can't actually change our eyes, but we can make them look
bigger with make-up. Eye make-up isn't new. Pictures in the Pyramids show that the ancient Egyptians
both men and women-used it. False eyelashes can make eyelashes longer. Eye shadow on the eyelids
can make the eyes look bigger and more dramatic．Glasses can also make eyes look bigger.
5. _______
We do not normally look into someone's eyes for long, especially when they are very close. Eye
contact can be very threatening, so people only do it when they want to threaten someone. It is also
very intimate. This is why lovers gaze into each other's eyes. It's also why people don't look at each
other in lifts.
A. Ways to beautify eyes
B. Proper use of eye contact
C. Techniques of sending eye signals
D. Colours of people's eyes
E. Functions of different parts of the eye
F. Variety of messages conveyed through
，
，得：y2﹣2pty﹣p2=0，
．
，
不可能为钝角，
，
，
，得：
，矛盾，
，
，|AB|=2p（t2+1），
，得：
，
，使得△ABC为正三角形．