【托福阅读】精选阅读真题长难句50句词海
1、 Later experiments in which rearchers played recordings of songs to young
birds showed just how preci this influence was, many of them would learn
the exact pattern of the recording they had heard.
2、 The crude song of a bird reared in isolation gives some clues as to what this
rough idea may be the length, the frequency range and the breaking up into
unique love
notes are all aspects of chaffinch song shared between normal birds and
tho reared in isolation.
3、 Whatever the nature of the learning rules in a particular species, there is no
doubt that they are effective, it is very unusual to hear a wild bird singing a
英语流利说
song which is not typical of its own species despite the many different songs
which often occur in a small patch of woodland.
英语大赛 4、 Chemical analysis of bones enables archaeologists to determine the
proportion of meat to vegetable foods in the diet by measuring the proportion
of calcium to strontium in ancient bone becau strontium in place of calcium
in bones comes primarily from ingested plants.
5、 Each dwelling had a different arrangement of the giant bones, which came
from the skeletons of long-dead animals retrieved from the surrounding area
by occupants of the site, not from animals they had recently hunted.
6、 In a precedent-tting decision, the Federal Energy Regulatory Commission
ordered the dam removed after concluding that the environmental and
economic benefits of a free-flowing river outweighed the electricity generated
by the dam.
7、 Built nearly a century ago to provide power to lumber and paper mills in the
town of Port Angeles, the dams blocked access to upstream spawning beds
for six species of salmon on what once was one of the most productive
salmon rivers in the world.
8、 The Hetch Hetchy Dam in Yomite National Park might be taken down to
reveal what John Muir, the founder of the prestigious environmental
organization Sierra Club, called a valley “just as beautiful and worthy of
prervation as the majestic Yomite.”
9、 A chance collision between two comets, or the gravitational influence of one
of the Jovian planets—Jupiter, Saturn, Uranus, and Neptune—may
occasionally alter the orbit of a comet in the regions enough to nd it to
barony the inner solar system and into our view.
10、 The comets appear to be distributed in all directions from the Sun, forming
a spherical shell around the solar system, called the Oort cloud, after the
Dutch astronomer Jan Oort.
11、 After the arrival of hunter-gatherers in the southwestern region of North
America, veral alternative types of agriculture emerged, all involving
different solutions to the Southwest’s fundamental problem: how to obtain
enough water to grow crops in an environment in which rainfall is so low and
unpredictable that little or no farming is practiced there today.
12、 That fate actually befell the Mimbres, who started by farming the floodplain
and then began to farm adjacent land above the floodplain as their
population came to exceed the floodplain’s capacity to support it.
13、 However, when drought conditions returned, that gamble left them with a
motherless
population double what the floodplain could support, and Mimbres society
collapd suddenly under the stress.
am是什么意思 14、 One more strategy was to plant crops at many sites even though rainfall was
locally unpredictable and then to harvest crops at whichever sites did get
宇航员的英文 enough rain to produce a good harvest and to redistribute some of the
harvest to the people still living at all the sites that did not happen to receive
enough rain that year.
椭圆公式 15、 Sanitation problems caud by larger, more dentary populations would
have helped transmit dias in human waste, as would the u of animal
dung for fertilizer.
16、 The increa in many of the came not only from the fact that fewer people
were dying from infectious dia and were living longer but also from the
乌克兰留学费用
results of modern lifestyles in developed countries and among the upper
class of developing countries – a more dentary life leading to less
physical activity, more stress; environmental pollution, and high-fat diets.
