第二节（共5小题；每小题2分，满分10分）
根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
Students will need to use all of their skills in order to understand the reading selections in Reader’s Choice.
71 These selections provide practice on employing different reading skills to get the message of the writer. They also give students practice in four basic reading skills: skimming, scanning, reading for thorough comprehension, and critical reading.
Skimming involves reading quickly through a text to get an overall idea of its contents. This kind of rapid reading is suitable when you are trying to decide if careful reading is desirable or 72
Like skimming, scanning is also quick reading. However, in this case the search is more concentrated. 73 When you read to find a particular date, or number you are scanning.
Reading for thorough comprehension is carefully reading in order to understand the total meaning of the passage. At this level of comprehension the reader is able to summarize the author’s ideas 74 .
Critical reading demands that a reader makes judgments about what he or she reads. This kind of reedit requires posting and answering questions such as “ 75 ”, “Do I share the author’s point of view?” and “Am I convinced by the author’s arguments and evidence?
A．Does my own experience support that of the author?
B．Reader’s Choice is one of the most popular magazines in the world.
C．but has not yet made a critical evaluation of those ideas.
D．The book contains many types of selections on a wide variety of topics.E To scan is to read quickly in order to find out specific information.
F. Do
I know about the author?
G. when there is no time to read something carefully.
，通过R1的电流I1＝3A，请你再补充一个条件，求出电阻R2的大小.