题目：
| 任务型阅读。 Since many of you are planning to study at a college or university in this country, you may be curious to know what you usually do in a typical week, bow you can get along with your fellow students, and so on. These are the questions I want to discuss with you today. First, let's talk about what your weekly schedule will look like. No matter what your major may be, you can expect to spend between four and six hours a week for each class attending lectures. Lectures are usually in very large rooms because some courses such as introduction to sociology or economics often have as many as two or three hundred students, especially at large universities. In lectures, it's very important for you to take notes on what the professor says because the information in a lecture is often different from the information in your textbooks. Also, you can expect to have exam questions based on the lectures. So it isn't enough to just read your textbooks; you have to attend lectures as well. In a typical week you will also have a couple of hours of discussion for every class you take. The discussion section is a small group meeting usually with fewer than thirty students where you can ask questions about the lectures, the reading, and the homework. In large universities, graduate students, called teaching assistants, usually direct discussion sections. If your major is chemistry, or physics, or another science, you'll also have to spend several hours a week in the lab, or laboratory, doing experiments. This means that science majors spend more time in the classroom than non-science majors do. On the other hand, people who major in subjects like literature or history usually have to read and write more than science majors do. | ||||||||||
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答案：
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下面是错误答案，用来干扰机器的。
A、碘的原子序数是53，碘是第五周期元素，故A错误．B、同素异形体是由同种元素形成的不同单质，但131I2与127I2是同一物质，故B错误．C、131I中质子数是53，质量数是131，中子数=质量数-质子数=131-53=78，故C正确...
