[单项选择]Trees are so common arid quiet that we pay them little mind. What, for instance, should we answer when asked to name the biggest living thing Earth has ever seen Dinosaurs Blue whales No, the largest sequoias in northern California weigh more than six blue whales. The tallest redwoods and Australian eucalyptus trees tower more than 300 feet high, three times the length of the greatest dinosaur.
(71) Some bristlecone pine trees in the American West are more than 4, 000 years old, seedlings at the time the Egyptians were building the Pyramids.
Trees sustain our lives and our planet in a thousand practical ways. This morning at breakfast—in your wood-framed house, on your wooden kitchen table—you might have enjoyed orange juice or a grapefruit. Both come to use from trees. Over your French toast you may have sprinkled cinnamon and nutmeg, the powdered bark and nuts of tropical trees. That quart of maple syrup on your table was boiled down from roughly 10 gallons of sap f
A. For centuries, the Chinese have derived medicines from the ginkgo tree.
B. Through photosynthesis, an acre of trees produces enough oxygen to sustain three humans.
C. As scientists unlock the secrets of trees, they uncover surprising tacts.
D. Trees have always been green machines, producing substances that humans learned to use.
E. You think, at 150 or more years, giant tortoises can live a long time
F. And the morning newspaper was printed on the processed wood pulp we call paper.

[单项选择]Trees are so common arid quiet that we pay them little mind. What, for instance, should we answer when asked to name the biggest living thing Earth has ever seen Dinosaurs Blue whales No, the largest sequoias in northern California weigh more than six blue whales. The tallest redwoods and Australian eucalyptus trees tower more than 300 feet high, three times the length of the greatest dinosaur.
(71) Some bristlecone pine trees in the American West are more than 4, 000 years old, seedlings at the time the Egyptians were building the Pyramids.
Trees sustain our lives and our planet in a thousand practical ways. This morning at breakfast—in your wood-framed house, on your wooden kitchen table—you might have enjoyed orange juice or a grapefruit. Both come to use from trees. Over your French toast you may have sprinkled cinnamon and nutmeg, the powdered bark and nuts of tropical trees. That quart of maple syrup on your table was boiled down from roughly 10 gallons of sap f
A. For centuries, the Chinese have derived medicines from the ginkgo tree.
B. Through photosynthesis, an acre of trees produces enough oxygen to sustain three humans.
C. As scientists unlock the secrets of trees, they uncover surprising tacts.
D. Trees have always been green machines, producing substances that humans learned to use.
E. You think, at 150 or more years, giant tortoises can live a long time
F. And the morning newspaper was printed on the processed wood pulp we call paper.

[填空题]We think it ______ (fool) to pay so much for it.

[单项选择]

OK, everybody. Be quiet, please! Can we begin the meeting now I am Mike Johnson, the chairman of the Graduation Committee for this year. I am honored to declare that all of you have been chosen as representatives to plan the graduation ceremony. Within a moment, I am sending around a sheet of paper for each of you and you are required to write down your names and telephone numbers. Also, please write down which part of the ceremony you’d like to work on. Remember, as a representative, you will have a lot of responsibilities to shoulder. So only sign up if you feel you have the time to participate. When everyone has finished writing down the information, please return the paper to me. What’s more, the time for next meeting has been changed. Yesterday I said that it would be held two days later. But now after our further discussion, it will be on next Friday. At our next meeting, one week from today, we will start to discuss the details of the graduation ceremony. At la
A. To determine who will graduate this year.
B. To discuss the seating arrangement.
C. To begin planning the graduation ceremony.

[填空题]So we asked our friends to help us. So we asked our friends ______ ______.

[填空题]So we asked our friends to help us.
So we asked our friends ______ ______.

[填空题]We had so many things that we couldn’t move them by ourselves.
We had too many things ______ move them by ourselves.

[单项选择]

We know that we have to pay for what we get. If we buy food, we know there will be a bill to pay. These are private bills. But there are also public bills that must be paid. Public bills are paid by the government. In turn, we get these services through taxes. What would happen if everyone in the city stopped paying taxes The water supply would stop; water might become unclean and impure. The streets might not be cleaned. There would be no police force to protect people and property. Schools would be closed. People would become sick and diseases might spread. We should not want to live in such a city. We all want pure water and food, clean streets and good schools. We want the police to prevent crime. The chief duty for every government is to protect persons and property. More than three quarters of the money spent by our government is used for this purpose. The next largest amount of public money goes to teach and train our citizens. Billions of dollars each year are spent on sc
A. By taxing public services.
B. By providing needed services.
C. By making people pay for private bills.
D. By collecting taxes.

[简答题]So we have focused on strategic areas where we can make the biggest impact on agricultural change that stretch from the farm to the market to the table and keep people nourished and productive, health systems that help people spend their days working rather than sick or dying, opportunities for women and girls that allow them to contribute to economic and social progress.

[单项选择]Yesterday we kept working （） the night, so we are very tired now.
A. during
B. for
C. throughout