单选题The United States court system is characterized by ______ hierarchies: there are both state and federal courts.

单选题 Listen to the following passage. Altogether the passage will be read to you four times. During the first reading, which will be done at normal speed, listen and try to understand the meaning. For the second and third readings, the passage will be read sentence by sentence, or phrase by phrase, with intervals of 15 seconds. The last reading will be done at normal speed again and during this time you should check your work. You will then be given 1 minute to check through your work once more. The Story of Tea Tea remained unknown to the western world/until the sixteenth century,/when European explorers who traveled to China and other Far Eastern countries/returned with a host of new foods, spices, and beverages.

单选题News about the Gulf War came pouring from a number of unnamed ______.

单选题A: Do you think you could lend me some of your records?B: Until when?A: Oh, just over the holidays.B: I'm not sure. ______

单选题I've worked here since I ______ Harvard Business School. A. leave B. left C. have left D. had left

单选题It's necessary that the president______in time to attend the meeting.

单选题A: I'm much grateful to you for everything you've done for me. B: __________________ A. Forget about it. B. That's all right. C. I'm pleased to be at your service. D. You are very welcome to visit our country.

单选题There" s growing______among the electorate with the old two-party system.

单选题 Professor Ashok Goel of Georgia Tech developed an artificially intelligent teaching assistant to help handle the enormous number of student questions in the online class, Knowledge-Based Artificial Intelligence. This online course is a core requirement of Georgia Tech's online Master of Science in Computer Science program. Professor Goel already had eight teaching assistants, but that wasn't enough to deal with the overwhelming number of daily questions from students. Many students drop out of online courses because of the lack of teaching support. When students feel isolated or confused and reach out with questions that go unanswered, their motivation to continue begins to fade. Professor Goel decided to do something to remedy this situation and his solution was to create a virtual assistant named Jill Watson, which is based on the IBM Watson platform. Goel and his team developed several versions of Jill Watson before releasing her to the online forums. At first, the virtual assistant wasn't too great. But Goel and his team sourced the online discussion forum to find all the 40,000 questions that had ever been asked since the class was launched. Then they began to feed Jill with the questions and answers. After some adjustments and sufficient time, Jill was able to answer the students' questions correctly 97% of the time. The virtual assistant became so advanced and realistic that the students didn't know she was a computer. The students, who were studying artificial intelligence, were interacting with the virtual assistant and couldn't tell it apart from a real human being. Goel didn't inform them about Jill's true identity until April 26. The students were actually very positive about the experience. The goal of Professor Goel's virtual assistant next year is to take over answering 40% of all the questions posed by students on the online forum. The name Jill Watson will, of course, change to something else next semester. Professor Goel has a much rosier outlook on the future of artificial intelligence than, say, Elon Musk, Stephen Hawking, Bill Gates or Steve Wozniak.

单选题In the deserted factory several huge machines were left to rust and {{U}}decay{{/U}}.

单选题Even more crucially, they are the product of an outdated political system which has consistently sacrificed the long term to the short term and abandoned principles for ______ .

单选题$50 billion might seem a lot of money, but it's a mere ______ in terms of what global capital markets can and do absorb.

单选题The battle is of great significance when viewed in the ______ of the progress of the war.

单选题The two ferry disasters occurred

单选题I don' t think he is serious, ______ ?

单选题______ is a slightly sour thick liquid made from milk with bacteria added to it, sometimes sweetened and flavored with fruit and sometimes eaten plain.

单选题(Human) society, (or in any) community, (may be spoken) (of as) a social organism.

单选题The actual cost of the building was much higher than our original ______.