Plants in Desert Only
special plants can survive in the terrible climate of a desert, for these are
regions where the annual range of the soil temperature can be over 75℃.
Furthermore, during the summer there are few clouds in the sky to protect plants
from the sun’s ray. Another problem is the fact that there are frequently strong
winds which drive small-sharp particles of sand into the plants, tearing and
damaging them. The most difficult problem for all forms of plant life, however,
is the fact that the entire annual rainfall occurs during a few days or weeks in
spring. Crasses and flowers in desert survive from one year to
the next by existing through the long, hot, dry season in the form of seeds.
These seeds remain inactive unless the right amount of rain falls. If no rain
fal A. the need little water for their survival B. they bear long roots and the seeds are fit for dry weather C. they stay in the form of seeds to wait for the right amount of water D. with long roots, they do not depend on the rain to get enough water
更多"{{B}}第三篇{{/B}}
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[单项选择]{{B}}第三篇{{/B}}
Plants in Desert Only
special plants can survive in the terrible climate of a desert, for these are
regions where the annual range of the soil temperature can be over 75℃.
Furthermore, during the summer there are few clouds in the sky to protect plants
from the sun’s ray. Another problem is the fact that there are frequently strong
winds which drive small-sharp particles of sand into the plants, tearing and
damaging them. The most difficult problem for all forms of plant life, however,
is the fact that the entire annual rainfall occurs during a few days or weeks in
spring. Crasses and flowers in desert survive from one year to
the next by existing through the long, hot, dry season in the form of seeds.
These seeds remain inactive unless the right amount of rain falls. If no rain
fal A. the strong winds B. the strong sun’s ray C. the long summer days D. the high soil temperature
[单项选择]{{B}}第三篇{{/B}}
Sport is not only physically
challenging, but it can also be mentally challenging. Criticism from coaches,
parents, and other teammates, as well as pressure to win can create an excessive
amount of anxiety or stress for young athletes(运动员). Stress can be physical
emotional, or psychological, and research has indicated that it can lead to
burnout. Burnout has been described as dropping or quitting of an activity that
was at one time enjoyable. The early years of development are
critical years for learning about oneself. The sport setting is one where
valuable experiences can take place. Young athletes can, for example, learn how
to cooperate with others, make friends, and gain other social skills that will
be used throughout their lives. Coaches and parents should be aware, at all
times, that their feedback to youngsters can grea A. to make sports less competitive B. to make sports more challenging C. to reduce their mental stress D. to increase their sense of success
[单项选择]第三篇
Water
The second most important constituent (构成成份) of the biosphere (生物圈) is liquid water. This can only exist in a very narrow range of temperatures, since water freezes at 0℃ and boils at 100℃. Life as we know it would only be possible on the surface of a planet which had temperatures somewhere within this narrow range.
The earth’s supply of water probably remains fairly constant in quantity. The total quantity of water is not known very accurately, but it is about enough to cover the surface of the globe to a depth of about two and three-quarter kilometers. Most of it is in the form of the salt water of the oceans about 97 percent. The rest is fresh, but three quarters of this is in the form of ice at the Poles and on mountains, and cannot be used by living systems until melted. Of the remaining fractional which is somewhat less than one per cent of the whole, there is 10—20 times as much stored underground water as t A. in the center of the earth. B. on the surface of our planet. C. in a very narrow range of temperatures. D. in the coastal areas of the earth.
[单项选择]{{B}}第三篇{{/B}}
{{B}}Egypt Felled by
Famine{{/B}} Even ancient Egypt’s mighty pyramid builders were
powerless in the face of the famine that helped bring down their civilisation
around 2180 BC. Now evidence gleaned from mud deposited by the River Nile
suggests that a shift in climate thousands of kilometres to the south was
ultimately to blame--and the same or worse could happen today.
The ancient Egyptians depended on the Nile’s annual floods to irrigate
their crops. But any change in climate that pushed the African monsoons
southwards out of Ethiopia would have diminished these floods.
Dwindling rains in the Ethiopian highlands would have meant fewer plants
to stablise the soil. When rain did fall it would have washed large mounts of
soil into the Blue Nile and into Egypt, along with sediment from the A. Change of climate. B. Famine. C. Flood. D. Population growth.
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