SAT真题类型：Critical Reading > Sentence Completions

　　Choose the word or set of words that, when inserted in the sentence, best fits the meaning of the sentence as a whole.

　　The ------- of trees in East Africa has caused the number of native antelopes to ------- sharply because they can live only where the forest is most dense.

　　(A) planting . . decline

　　(B) destruction . . grow

　　(C) felling . . decrease

　　(D) abundance . . dip

　　(E) protection . . drop

2013年8月18日SAT考试官方每日一题答案：C

解析：This sentence asks you to recognize a cause and effect relationship: a decreasing number of trees causes antelope populations to decrease. The only option in which both terms have a logical cause and effect relationship is “felling . . decrease.”

SAT真题类型：Writing > Improving Sentences

　　Part or all of the following sentence is underlined; beneath the sentence are five ways of phrasing the underlined material. Select the option that produces the best sentence. If you think the original phrasing produces a better sentence than any of the alternatives, select choice A.

　　Unlike an acoustic guitar, whose hollow body acts as a sound box to project sound, there is almost no sound when a solid-body electric guitar is not amplified.

　　(A) there is almost no sound when a solid-body electric guitar is not amplified

　　(B) there is not an amplification system, so a solid-body electric guitar makes almost no sound

　　(C) an amplification system is needed for solid-body electric guitars, if they are to make much sound

　　(D) the electric guitar’s solid body makes it have almost no sound without the aid of an amplification system

　　(E) the solid-body electric guitar is almost soundless without the aid of an amplification system

2013年8月19日SAT考试官方每日一题答案：E

解析：Choice (E) is correct. It avoids the error of the original by directly comparing one type of guitar (“an acoustic guitar”) to another (“the solid-body electric guitar”).

SAT真题类型：Mathematics > Standard Multiple Choice

　　Read the following SAT test question and then click on a button to select your answer.

　　Of employees, are to be assigned an office and are to be assigned a cubicle. If   of the employees are men and are women, and if those assigned an office are to be chosen at random, what is the probability that the offices will be assigned to of the men and of the women?

　　(A)

　　(B)

　　(C)

　　(D)

　　(E)

2013年8月20日SAT考试官方每日一题答案：D

解析：Of the office workers, are to be assigned an office. This is an example of combinations: to find the number of ways of choosing of the workers, you can count the number of ways of selecting the workers one at a time and then divide by the number of times each group of workers will be repeated.

There are ways of choosing the first worker to get an office. Then there will be ways of choosing the second worker to get an office, and ways of choosing the third worker. This is a total of possibilities. In these possible selections, each distinct group of workers will occur times. (There are possibilities for the first worker chosen from the group, for the second worker chosen, and only for the third.) Therefore, there are different ways the workers who get an office can be chosen from the workers.

How many of these possible groups of workers consist of men and woman? From the male workers, can be chosen in different ways. There are possibilities for the female worker. Therefore, of the groups of workers consist of men and woman.

Since there are different ways the workers who get an office can be chosen, and of these possible groups of workers consist of men and woman, the probability that the offices will be assigned to men and woman is , or .