单选题It is implied in the selection that the tiny bits of dust are______.

单选题According to the passage, the Speech Machine's system was developed by ______.

单选题-I can not repair these until tomorrow, I'm afraid. -That's OK, there's[A] no problem[B] no wonder[C] no doubt[D] no hurry

单选题Why does the man go to see the woman?

单选题WhatwillmostAmericansdowhentheyneedadvice?A.Turntotheirparents.B.Writetonewspapersandmagazines.C.Askpeoplewhotheydon'tknow.

单选题The President mainly talked about ______.

单选题Understanding how nature reacts to climate (气候) change will require checking key life cycle events--flowering, the appearance of leaves, the first frog calls of the spring--all around the world. But ecologists (生态学家) can't be everywhere, so they're turning to non-scientists, sometimes called citizen scientists, for help. A group of scientists and educators set up an organization last year called the National Phenology Network. "Phenology" is what scientists call the study of the timing of events in nature. One of the group's first efforts is to ask scientists and non-scientists to collect information about plant flowering and leafing every year. The program, called Project BudBurst, collects life cycle information on a variety of common plants from across the United States. People taking part in the project record their information on the Project BudBurst website. "People don't have to be scientists--they just have to look around and see what's in their neighbourhood," says Jennifer Schwartz, a scientist with the project. "As we collect this information, we'll be able to know about the changes of plants and animals as the climate changes. " Not only that, the information also helps scientists learn about how these changes will have an effect on people, Scientists examining lilac (丁香花) flowering in western United States reported that in years when lilacs flowered early--before May 20th-wildfires later in the summer and fall were likely to be larger and more serious. Lilac flowering, then, could serve as an alarm bell. "The best way for us to increase our knowledge of how plants and animals are reacting to climate change is to increase the count of information we have," Schwartz says. "That's why we need citizen scientists to get as much information from as many places on as many plants and anireals over as long a time period as we can. /

单选题Mike was always speaking highly of his role in the play, ______of course, made the others unhappy.

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单选题Nothing was going right for Dr. Turner at the hospital. He made a mistake while operating on a patient. He felt sure he was no longer trusted and decided to change his job. One day he learned from the paper that a doctor was looking for a partner. The doctor, whose name was Johnson, lived in Thorby, a small town in the north of England. A few days later Dr. Turner went to Thorby, and arrived at Dr. Johnson's home early in the afternoon. Though old and a little deaf (聋的), Dr. Johnson still had a good brain. He kept talking to the visitor about the town and its people. When they turned to the question of partnership, it was already seven in the evening. Dr. Johnson invited Dr. Turner to have dinner with him in a restaurant before catching the train back to London. Dr. Turner noticed that Dr. John son was fond of good food and expensive wines. They had an excellent meal. When the bill was brought, Dr. Johnson felt in his pocket. "Oh, dear," he said. "I've forgotten my money." "That's all right," Dr. Turner said. "I' 11 pay the bill." As he did so, he began to wonder whether Dr. Johnson was worthy of trust.

单选题The village is quiet ______ some birds singing in the woods.

单选题All the leading newspapers ______ the trade talks between China and the USA.[A] reported[B] printed[C] announced[D] published

单选题Wheredidthisconversationtakeplace?A.Onthestreet.B.Inahospital.C.Atschool.

单选题Whowasthespeaker?A.Alibrarian.B.Aprofessor.C.Aresearcher.