[填空题]When a man has a biological need is always automatically satisfied.

[单项选择]Throughout all ages man has always carved colossal (巨大的) figures out of stone. This can be seen in the ancient ruins of Egypt, Persia and Babylon. In modern times America has also taken up the same challenge and has carved huge sculptures into her mountains.
On the East Coast of America not far from Atlanta, Georgia stands Stone Mountain, the largest mass of exposed granite (花岗石) in the world. Carved into the side of this mountain are three tremendous equestrian figures. They are sculptures of Jefferson Davis, Robert E. Lee and "Stonewall Jackson." It is a memorial to the Confederacy. The colossal figure of Lee alone measures 138 feet from the top of his head to the tip of his horse’s hoof. To see these stone sculptures on the side of a mountain is most impressive and inspiring. It was commissioned in 1916 and was begun by Gutzon Borglum, the sculptor of Mt. Rushmore, but was not completed until 1969 by Walter K. Hancock.
In South Dakota, a western state., is located ano
A. All nations have carved colossal figures on the stone.
B. Only in Egypt, Persia and Babylon people can carve colossal figures.
C. There are also some great sculptures in America.
D. America is a challenge to other counties.

[单项选择]The dog has always been considered man’s best friend. Always noted for being particularly faithful in watching over children, he also has his place by the fireside, in the cow pasture, on the sheep range, and beside the hunter in forest or blind. He is easy to train, works hard, and often performs astonishing feats. And in the frozen polar regions he was once the principal motive power, before being largely displaced by the plane and helicopter.
(77) Because he howls or whines in the presence of impending death, the dog was once thought to have supernatural powers and believed to be capable of seeing gods and ghosts invisible to men. Actually, the basis for these beliefs lies in the hound’s sensitivity to people’s feelings and his superior hearing ability and sense of smell, which enable him to detect signs hidden from human observation. His record of saving lives is outstanding, for he often gives warning of fire and other dangers not noticed by his master.
The dog’s
A. protecting children
B. assisting shepherds
C. helping hunters
D. herding cattle

[单项选择]
Being a man has always been dangerous. There are about 105 males born for every 100 females, but this ratio drops to near balance at the age of maturity, and among 70-year-old there are twice as many women as men. But the great universal of male mortality is being changed. Now, boy babies survive almost as well as girls do. This means that, for the first time, there will be an excess of boys in those crucial years when they are searching for a mate. More important, another chance for natural selection has been removed. Fifty years ago, the chance of a baby(particularly a boy baby) surviving depended on its weight. A kilogram too light or too heavy meant almost certain death. Today it makes almost no difference. Since much of the variation is due to genes, one more agent of evolution has gone.
There is another way to commit evolutionary suicide : stay alive, but have fewer children. Few people are as fertile as in the
A. A lack of mates.
B. A fierce competition.
C. A lower survival rate.
D. A defective gen

[单项选择]Being a man has always been dangerous. There are about 105 males born for every 100 females, but this ratio drops to near balance at the age of maturity, and among 70-year-olds there are twice as many women as men. But the great universal of male mortality is being changed. Now boy babies survive almost as well as girls do. This means that, for the first time, there will be an excess of boys in those crucial years when they are searching for a mate. More important, another chance for natural selection has been removed. Fifty years ago, the chance of a baby (particularly a boy baby) surviving depended on its weight. A kilogram too light or too heavy meant almost certain death. Today it makes almost no difference. Since much of the variation is due to genes, one more agent of evolution has gone.
There is another way to commit evolutionary suicide: stay alive, but have fewer children. Few people are as fertile as in the past. Except in some religious communities, very few women ha
A. decreased
B. increased
C. changed
D. gone away