题目

下列关于光现象的说法正确的是（ ） A.彩虹是由于光的反射形成的B.光从空气进入水中，传播方向不一定改变C.人能通过平静的湖面看到自己的脸是光的折射现象D.阳光照射下，地面上呈现电线杆的影子是由于光的直线传播形成的 答案：BD  解析：雨后天空中的彩虹是阳光被空气中的小水珠折射后，发生色散形成的，与光的反射无关， A选项错误。光从空气进入水中，垂直进入时传播方向不变， B选项正确。人能通过平静的湖面看到自己的脸是在水面成的像，是由光的反射形成的， C选项错误。光照射下，地面上呈现电线杆的影子是由Deciding which English-speaking country to study in wasn’t difficult for Ann; She had always wanted to visit America. “I wanted to study in an  English-language country and I always wanted to visit America because it always seemed to me a very beautiful and friendly country.” Ann is more than happy with the quality of the education she is receiving in America, particularly with the subjects and strong academic support.“ I am very happy with the quality of education I am receiving. All my subjects are useful and connected. I am happy with help I receive from the lecturers and tutors.” Also of particular satisfaction for Ann is the practical element of her American course. “I find it very important and useful. The theory is a good thing to know but nothing gives you more skills and knowledge than practical work.” Where her future employment is concerned, Ann is very confident her American qualification will be of great help. “I know that getting a degree here is a good thing for my future; it can open many doors in Poland or anywhere  else in the world.” Ann is also really enjoying life in America; She is making friends and taking time out to enjoy herself. “People are very friendly and helpful. University is a good place to find new friends from America and from overseas. It is a friendly environment with lots of things to do, not only studying. And of course there are the beaches, not to mention the beautiful weather.” 1.The purpose of writing this passage is to _________. A．tell us Ann’s decision to settle in America B．tell us Ann is accustomed to life in America C．introduce Ann’s happy study and life in America D．introduce more about Ann to help her make friends 2.Why did Ann decide to study in America? A．Her parents persuaded her to do so. B．She has relatives and best friends here. C．Her boyfriend was studying here too then. D．She has dreamed of studying here for long. 3.What makes Ann particularly satisfied in America? A．The comfortable climate and easy lifestyle. B．The help from her host families and teachers. C．The American courses have more practical elements. D．The friends here are mostly from English-speaking countries. 4.What does the underlined sentence mean? A．Ann will try all her best to ensure to get a degree. B．Ann’s degree will help her find a job easily at home and abroad. C．Ann will certainly go back to Poland to work after graduation. D．With the degree received in America, Ann will never be out of work.