单选题 Directions: Read the
following text. Choose the best word(s) for each numbered blank.
Our ape-men forefathers had no obvious
natural weapons in the struggle for{{U}} (1) {{/U}}in the open. They had
neither the powerful teeth nor the strong claws of the big cats. They could not
{{U}}(2) {{/U}}with the bear, whose strength, speed and claws{{U}}
(3) {{/U}}an impressive " small fire" weaponry. They could not even
defend themselves{{U}} (4) {{/U}}running swiftly like the horses, zebras
or small animals. If the ape-men had attempted to compete on those terms in the
open, they would have been{{U}} (5) {{/U}}to failure and extinction. But
they were{{U}} (6) {{/U}}with enormous concealed advantages of a kind
not possessed by any of their competitors. In the
search{{U}} (7) {{/U}}the pickings of the forest, the ape-men had{{U}}
(8) {{/U}}efficient stereoscopic vision and a sense of color that the
animals of the grasslands did not{{U}} (9) {{/U}}. The ability to see
clearly at close range permitted the ape-men to study practical problems in a
way that lay far{{U}} (10) {{/U}}the reach of the original inhabitants
of the grassland. Good long-distance sight was{{U}} (11) {{/U}}another
matter. Lack of long-distance vision had not been a problem for forest-dwelling
apes and monkeys because the{{U}} (12) {{/U}}the viewpoint, the greater
the range of sight-so{{U}} (13) {{/U}}they had had to do was climb a
tree. Out in the open, however, this simple solution was not{{U}} (14)
{{/U}}. Climbing a hill would have helped, but in many places the ground was
flat. The ape-men{{U}} (15) {{/U}}the only possible solution. They
reared up as high as possible on their hind limbs and began to walk{{U}}
(16) {{/U}}. This vital change of physical position brought about
considerable disadvantages. It was extremely unstable and it meant that the
already slow ape-men became{{U}} (17) {{/U}}still. {{U}}(18)
{{/U}}, they persevered and their bone structure gradually became{{U}}
(19) {{/U}}to the new, unstable position that{{U}} (20)
{{/U}}them the name Homo erectus, upright man.
【答案解析】accustomed表示“习惯的,适应的”,常用结构为be accustomed to,意思是“习惯于……”;famifiarized的常用结构为be familiarized with,意思是“与……相熟”;adapt 表示“适应”时,常用adapt to sth.或adapt oneself to sth.结构,暗含作出某种变化以适应新的情况;be suited to sth.表示“适合……的”。这里是说“它们的骨骼渐渐适应了……”,故选项C为正确答案。