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问题 选择题

储光羲的名句“潭清疑水浅，荷动知鱼散”。其中“潭清疑水浅”是说从平静清澈的水面向下看到的潭底比实际深度要浅些，引起这一现象的原因是

A．光的直线传播

B．光的反射

C．光的折射

D．光的色散

答案

答案：C

题目分析：看到池底比实际浅是由于光的折射形成的，在水潭边上看到水潭中游鱼比其实际位置浅，这是光的折射现象．

单项选择题

请根据下面短文回答第11～15题：
Reading for pleasure is the easiest way to become a better reader in English. It is also the most important way.
Some students say they don’t want to read for pleasure. They say they want to use their time to learn the rules of the language and new words. They say that pleasure reading is too easy.
Many experts(专家)say pleasure reading is very important for learning English. Dr. Stephen Krashen, a famous expert on learning languages, says that pleasure reading helps you learn many important things about English. Students learn more grammar and more words when they read for pleasure. They also learn more about good writing.
Dr. Krashen tells us that pleasure reading helps each student in a different way. Each student needs to learn something different. Pleasure reading makes it possible for each student to learn what he or she needs.
Reading for pleasure is not the same as studying. When you read for pleasure, you choose your own books, and you don’t have to remember everything. There are no tests on your pleasure reading books. Pleasure reading will help you:
—learn how English speakers use English
—read faster in English
—find examples of good writing in English
—learn new words
—learn about the cultures(文化)of English speakers

When you read for pleasure, ______.
[A] you must read very fast
[B] you can read your favorite books
[C] you must remember many new words
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多选题

对于相同条件下相同物质的量的O2和O3，下列说法中正确的是（　　）

A．体积之比为1：1

B．原子总数之比为2：3

C．原子总数之比为1：1

D．体积之比为2：3
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