[填空题]Dr Pagel studied 122 family trees in that there were more genetic changes in them.

[填空题]Dr Pagel studied 122 family trees in that there were more genetic changes in them.

[填空题]Both Dr Jablonski and Dr Pagel have found ______ between opposing ideas.

[单项选择]

The Enormous Egg

Dr. Ziemer arrived while we were still staring at the thing in the nest. He jumped out his car and came running out to in the backyard. He was wearing a red coat over his pajamas, and he looked pretty excited.
He ran up to the nest and looked in. His eyes opened up wide and he knelt down on the ground and stared and stared. After long while he said softly, "That’s it. By George, that’s just what it is. " Then he stared for another long time and finally he shook his head and said, "It can’t be true, but there it is. "
He got up off his knees and looked around at us. His eyes were just sparking, he was so excited. He put his hand on my shoulder, and I could feel he was quivering. "An amazing thing’s happened, "he said, in a kind of whisper. "I don’t know how to account for it. It must be some sort of freak biological mix-up that might happen once a thousand years. "
"But what is it " I asked.
D
A. Right
B. Wrong
C. Not mentioned

[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 all know that trees are very (11) in our daily life. They give us many things, such as wood, oxygen, and many other things. They can also tell us a lot about our (12) , too.
If you cut across a tree, you can see that it has many rings. Most trees grow one new ring (13) . Because of the rings of the tree we know how old it is.
When the climate is (14) or cold, trees do not grow very much and their rings are usually thin. When it is wet and good for trees, the rings are much thicker. If the rings are suddenly (15) or suddenly much thicker, it means that the climate changed suddenly.