[单项选择]Certain animals have an intuitive awareness of quantities, They know without analysis the difference between a number of objects and a smaller number. In his book The Natural History of Selbourne (1786), the naturalist Gilbert White tells how he surreptitiously removed one egg a day from a plover’s nest, and how the mother laid another egg each day to make up for the missing one. He noted that other species of birds ignore the absence of a single egg but abandon their nests if more than one egg has been removed. It has also been noted by naturalists that a certain type of wasp always provides five — never four, never six — caterpillars for each of their eggs so that their young have something to eat when the eggs hatch. Research has also shown that both mice and pigeons can be taught to distinguish between odd and even numbers of food pieces.
These and similar accounts have led some people to infer that creatures other than human can actually count. They also point to dogs that
A. show how attitudes have changed since 1786.
B. contradict the idea that animals can count.
C. provide evidence that some birds are aware of quantities.
D. indicate that more research is needed in this field.

[单项选择]Certain animals have an intuitive awareness of quantities, They know without analysis the difference between a number of objects and a smaller number. In his book The Natural History of Selbourne (1786), the naturalist Gilbert White tells how he surreptitiously removed one egg a day from a plover’s nest, and how the mother laid another egg each day to make up for the missing one. He noted that other species of birds ignore the absence of a single egg but abandon their nests if more than one egg has been removed. It has also been noted by naturalists that a certain type of wasp always provides five — never four, never six — caterpillars for each of their eggs so that their young have something to eat when the eggs hatch. Research has also shown that both mice and pigeons can be taught to distinguish between odd and even numbers of food pieces.
These and similar accounts have led some people to infer that creatures other than human can actually count. They also point to dogs that
A. Careful training is required to teach animals to perform tricks involving numbers.
B. Animals cannot "count" more than one kind of object.
C. Of all animals, dogs and horses can count best.
D. Although some animals may be aware of quantities, they cannot actually count.

[单项选择] Adaptation of Living Things Certain animals and plants develop characteristics that help them cope with their environment better than others of their kind. This natural biological process is called adaptation. Among the superior characteristics developed through adaptation are those that may help in getting food or shelter, in providing protection, and in producing and protecting the young. That results in the evolution of more and more organisms that are better fitted to their environments. Each living thing is adapted to its way of life in a general way, but each is adapted especially to its own distinct class. A plant, for example, depends upon its roots to fix itself firmly and to absorb water and inorganic chemicals. It depends upon its green leaves for using the sun’’s energy to make food from inorganic chemicals. These are general adaptations, common to most plants. In addition, there are special adaptations that only certain kinds of plant
A. help others of their kind get food, shelter and other things needed.
B. survive even in extremely severe conditions
C. become better adapted to the environments than others of their kind.
D. result in the evolution and production of more intelligent organisms.