What will man be like in the future—in 5 000 or even 50 000 years from now We can only make a guess, of course, but we can be sure that he will be different from what he is today. For man is slowly changing all the time.
Let us take an obvious example. Man, even five hundred years ago, was shorter than he is today. Now, on average, men are about three inches taller. Five hundred years is a relatively short period of time, so we may assume that man will continue to grow taller.
Again, in the modern world we use our brains a great deal. Even so, we still make use of only about 20% of the brain’s capacity. As time goes on, however, we shall have to use our brains more and more, and eventually we shall need larger ones. This is likely to bring about a physical change to the head, in particular the forehead,
A. how man’s life will be in the future
B. how future man will look like
C. the fact that man’s organs will function differently in the future
D. the fact that man is growing uglier as time passes
[单项选择] Passage Five
What produces a waterproof super glue,
acts like a vacuum cleaner, and even teaches scientists about gene repair The
humble little shellfish known as the mussel (贻贝)。
Mussels are
found worldwide. Some live in the sea. Others inhabit freshwater streams and
lakes. When you try to move a mussel from a rock, you will discover what an
incredibly firm grip it has- a necessity if the mussel is to resist the sharp
grab of a hungry seabird or the pounding waves of the sea. How does it manage to
cling so tight When it choose a place to set up home, it pokes its
tongue-shaped foot out of its shell and presses it against a solid surface.
Special glands give off a fluid mixture of proteins into a channel that runs the
length of the foot. The liquid quickly hardens into a fine, elastic thread about
an inch long. Then a tiny pad-like structur
A. seal itself from being damaged by sea water
B. protect itself from being the food of other animals
C. protect itself from being blown away by strong wind
D. produce the waterproof super glue
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