题型:任务型阅读 题类:常考题 难易度:普通
陕西省商洛市2019~2020学年高二下学期英语期末考试试卷
Trees are commonly cut down for wood and paper. . The unique chemical process that trees and plants use to turn light energy from the sun into oxygen is known as photosynthesis (光合作用).
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The production of oxygen is a result of photosynthesis, but it is not the main purpose of this process. . Plants create their own food through photosynthesis. During this process, a plant's roots absorb water from the ground, and its leaves take in light energy and carbon dioxide. The plant uses these elements to make fats and proteins that are then used to maintain the plant's life.
The process of photosynthesis
The first step in photosynthesis is using the sun's energy. During this process, chlorophyll (叶绿素) absorbs the light energy of the sun. The energy from the sun then acts upon the water absorbed by the roots of the plant. Carbon dioxide sent into the atmosphere by animals and humans is then absorbed by the plant's leaves and paired with the hydrogen to produce sugar. The sugar is turned into plant food. .
Threats to tree photosynthesis
. Today, only about 30 percent of Earth's land is covered in trees. This is contributing to global warming since trees are necessary to consume the carbon dioxide in the atmosphere. Experts believe planting trees is vital in order to ensure the preservation of the delicate balance that enables photosynthesis.
A. The purposes of photosynthesis
B. The advantages of photosynthesis
C. In fact, oxygen is simply a by product
D. It is also responsible for giving plants their green color
E. During this process extra oxygen is produced and released
F. The trees that change carbon dioxide into oxygen are disappearing rapidly
G. But the greatest value of trees comes from their ability to turn the sun's energy into chemical energy
I love Fridays. And so I celebrate Fridays.
After dropping my son off at school I head to Starbucks to pick up a coffee treat or another. Then instead of driving straight home I take a long route through the most beautiful roads I can find. I see footballs being passed on lawns, hamburgers being thrown on grill(烤架), and parties everywhere swinging into action.{#blank#}1{#/blank#}
The o0ther day I came out from the doctor's office happy over a positive prognosis(预断). Seeing the signs of spring around me-flowers, birds, sunshine, I was suddenly ready to celebrate. {#blank#}2{#/blank#}
My mind rebelled. “What are you doing? It's Tuesday! Coffee treats are reserved for Fridays!”{#blank#}3{#/blank#} Why should Fridays be any more special than any other day of the week? Why waste six days while waiting to celebrate the seventh? Minutes later I was walking back to my car with a big smile on my face and a coffee in my hand.
A small victory, to be sure, but it's also an accurate example of how many of us live our lives. We're waiting for conditions to be right before we allow ourselves to enjoy our time here on earth. Maybe when we finally graduate from college and get a job, it will be time to celebrate, or perhaps when our babies are old enough to be in school all day. We'll celebrate when the car is paid off, or enjoy life when we're finally able to retire. {#blank#}4{#/blank#} What if we moved a little of that “Friday feeling” into our rainy-day Mondays, our dull Tuesday and our mid-week Wednesdays? {#blank#}5{#/blank#}
A. You must spend more time achieving it. B. Surely our lives would be much happier as a result. C. It seems as if the whole world is celebrating Friday! D. But suddenly I realize how ridiculous that line of thinking was! E. Find an excuse to celebrate and start sending out hose invitations. F. I headed for the coffee bar that was located just around the corner. G. And in that waiting we waste so much of life and happiness that can be found in our Todays. |
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