题目内容
（2017·北京卷·单项填空）Many airlines now allow passengers to print their boarding passes online ______ their valuable time.
A. save B. saving C. to save D. saved
天天向上一本好卷系列答案
小学生10分钟应用题系列答案Passage 4（2016届江西省九校高三下学期联考）
体裁 | 话题 | 词数 | 难度 | 建议时间 |
说明文 | 狗的祖先 | 325 | ★★★☆☆ | 8分钟 |
Where do dogs come from?
Gray wolves are their ancestors. Scientists are pretty consistent about that. And researchers have suggested that dogs’ origins can date back to Europe, the Near East, Siberia and South China. Central Asia is the newest and best candidate, according to a large study of dogs from around the world.
Laura M. Shannon and Adam R. Boyko at Cornell University, and an international group of other scientists, studied not only purebred(纯种的) dogs, but also street or village dogs.
Dr. Shannon analyzed three different kinds of DNA, Dr. Boyko said, the first time this has been done for such a large and diverse group of dogs from 38 countries. And that led them to Central Asia as the place of origin for dogs in much the same way that genetic studies have located the origin of modern humans in East Africa.
The analysis, Dr. Boyko said, pointed to Central Asia, as the place where ＂all the dogs alive today＂ come from. The data did not allow precise dating of the origin, he said, but showed it occurred at least 15,000 years ago.
Greger Larson of Oxford University, who is leading a large international effort to analyze ancient DNA from fossilized bones, said he was impressed by the study. ＂It’s really great to see not just the number of street dogs, but also the geographic breadth and the number of remote locations where the dogs were sampled,＂ he said in an email. He also praised the sampling of different kinds of DNA and the analytic methods.
Dr. Larson, who was not involved with the study, said he thought the Central Asia finding required further testing. He said he suspected that the origins of modern dogs were ＂extremely messy＂ and that no amount of sampling of living populations will be definitive. He said a combination of studies of modern and ancient DNA is necessary.
1.According to the research on a large number of dogs, we can know____________.
A. dogs mainly lived in Europe and the Far East
B. dogs would like to live in Central Asia
C. dogs’ ancestors come from gray wolves
D. the Near East has many gray wolves
2.What can we infer from what Dr. Boyko said?
A. There are three different kinds of DNA in dogs.
B. This is the second time they have done so many dogs.
C. They only do research on village dogs from many countries.
D. Modern humans are from East Africa while dogs come from Central Asia.
3.Greger Larson got a very deep impression of his study because he____________.
A. found the study based on many different dogs and the sample dogs’ remote locations
B. saw the number of street dogs from fossilized bones
C. watched the geographic breadth of the sampled dogs
D. praised his teammates for their hard work on the dogs
4.Who wasn’t engaged in the study of dogs’ origins?
A. Laura M. Shannon B. Adam R. Boyko
C. Shannon and Boyko D. Greger Larson
Passage1（2017·全国新课标I，A）
体裁 | 话题 | 词数 | 难度 | 建议时间 |
应用文 | Pacific Science Center | 231 | ★★☆☆☆ | 5分钟 |
Pacific Science Center Guide
◆Visit Pacific Science Center’s Store
Don’t forget to stop by Pacific Science Center’s Store while you are here to pick up a wonderful science activity or souvenir to remember your visit. The store is located(位于) upstairs in Building 3 right next to the Laser Dome.
◆Hungry?
Our exhibits will feed your mind, but what about your body? Our café offers a complete menu of lunch and snack options, in addition to seasonal specials. The café is located upstairs in Building 1 and is open daily until one hour Pacific Science Center closes.
◆Rental Information
Lockers are available to store any belongs during your visit. The lockers are located in Building 1 near the Information Desk and in Building 3. Pushchairs and wheelchairs are available to rent at the Information Desk and Denny Way entrance. ID required.
◆Support Pacific Science Center
Since 1962, Pacific Science Center has been inspiring a passion(热情) for discovery and lifelong learning in science, math and technology. Today, Pacific Science Center serves more than 1.3 million people a year and brings inquiry-based science education to classrooms and community events all over Washington State. It’s an amazing accomplishment and one we cannot achieve without generous support from individuals, corporations, and other social organizations. Visit pacificsciencecenter.org to find various ways you can support Pacific Science Center.
1.Where can you buy a souvenir at Pacific Science Center?
A. In Building 1.
B. In Building 3.
C. At the Laser Dome.
D. At the Denny Way entrance.
2.What does Pacific Science Center do for schools?
A. Train science teachers.
B. Distribute science books.
C. Inspire scientific research.
D. Take science to the classroom.
3.What is the purpose of the last part of the text?
A. To encourage donations.
B. To advertise coming events.
C. To introduce special exhibits.
D. To tell about the Center’s history.