●Question 1. Sentence Correction
Direction: Correct the underlined part

Reared apart from each other, a recent United States study showed striking similarities in identical twins, including many idiosyncrasies of behavior.

A. Reared apart from each other, a recent United States study showed striking similarities in identical twins, including many idiosyncrasies of behavior.
B. Reared apart from each other, striking similarities between identical twins that include many idiosyncrasies of behavior were shown in a recent United States study.
C. A recent United States study showed striking similarities in identical twins reared apart from each other that include many idiosyncrasies of behavior.
D. According to a recent United States study, identical twins reared apart from each other showed striking similarities, including many idiosyncrasies of behavior.
E. According to a recent United States study, identical twins showed striking similarities reared apart from each other, including many idiosyncrasies of behavior.

●Question 2. Critical Reasoning

The school board has determined that it is necessary to reduce the number of teachers on the staff. Rather than deciding which teachers will be laid off on the basis of seniority, the school board plans to lay off the least effective teachers first.

The school board’s plan assumes that

A. there is a way of determining the effectiveness of teachers
B. what one individual defines as effective teaching will not be defined as effective teaching by another individual
C. those with the most experience teaching are the best teachers
D. those teachers who are paid the most are generally the most qualified
E. some teachers will be more effective working with some students than with other students

●Question 3. Data Sufficiency
Directions: In this problem, a question is followed by two statements containing certain data. You are to determine whether the data provided by the statements are sufficient to answer the question. Choose the correct answer based upon the statement’s data and your knowledge of mathematics.

(DS) 3^(x+y)/3^(x-y)=?
1) x=2
2) y=3

A. statement 1 alone is sufficient, but statement 2 alone is not sufficient to answer the question
B. statement 2 alone is sufficient, but statement 1 alone is not sufficient to answer the question
C. both statements taken together are sufficient to answer the question, but neither statement alone is sufficient
D. each statement alone is sufficient
E. statements 1 and 2 together are not sufficient, and additional data is needed to answer the question


●Question 4. Problem Solving

Which of the following is the closest to 10^(-4)-10^(-10)?
A. 10^(-4) B. 10^(-6) C. 10^(-8) D. 10^(-10) E. 10^(-12)

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●Answer to Q1: D
‘Reared apart from each other’ should not modify the subjects in A and B in terms of achieving the logical meaning. In other words, the participle phrase should be connected structurally with ‘identical twins’. In C, ‘that include many idiosyncrasies of behavior’ is misplaced because the relative clause should modify ‘striking similarities’. Also in E, ‘reared apart from each other’ is not in the ideal position to modify ‘identical twins’. So, the answer is D.

●Answer to Q2: A
If there is no way of determining the effectiveness of teachers, the conclusion that the school can lay off the least effective teachers can’t be justified. All the answer choices except for A are irrelevant in terms of connecting the decision made by the school board with the plan of the school board.

●Answer to Q3: B
On the original condition, 3^(x+y)/3^(x-y)=3^(x+y-x+y)=3^(2y), because when the value of y is known, the question is sufficient, con 2) is sufficient, the best answer is B.

●Answer to Q4: A
Because 10^(-10) is almost zero, 10^(-4)-10^(-10)=10^(-4)-0=10^(-4), therefore the best answer is A.