2. 外语
  3. Now that you’ve gotten a little more confident, we’re going to give you the opportunity to practice "without the training wheels

Now that you’ve gotten a little more confident, we’re going to give you the opportunity to practice "without the training wheels

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问题 Now that you’ve gotten a little more confident, we’re going to give you the opportunity to practice "without the training wheels." When you want to check your work, you can turn to the solutions at the end. If you aren’t familiar with some of the mathematical concepts, make a note to pay particular attention to that chapter in this book; this practice set covers a wide range of topics tested on the GMAT.
   On all data sufficiency problems, the answer choices are the same (as you’ve learned). We’ve put them here for your reference.
   Ａ. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
   Ｂ. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
   Ｃ. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
   Ｄ. EACH statement ALONE is sufficient.
   Ｅ. Statements (1) and (2) TOGETHER are NOT sufficient.
Is s=r?
   (1) s2=r2
   (2) s is positive.
选项
答案E
解析 Here’s another question that is looking for a yes or no answer. Statement (1) allows for both positive and negative values of both s and r, so we cannot tell ff s = r. Statement (1) is not sufficient; cross off A and D.
   Statement (2) just tells us that s is a positive number; we don’t know anything about r at all and cannot tell if they are equal; statement (2) alone is not sufficient. Let’s eliminate B.
   What if we combine the two? Statement (2) tells us that s is positive, but r could still be either positive or negative. We still cannot tell if they are equal, so the answer is E.
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