GRE考试

【单选题】Directions: In the following questions, choose the best answer from the five choices listeD、
An operation, *, is defined as follows: for any positive numbers a and
B、
Which of the following is an integerA．11*5

B、4*9
C．4*16
D．7*4
E、9*9

网考网参考答案：D
网考网解析：
There’s nothing to do except check each choice until you find one that works. In ques-tions such as this, it is often faster to start’with E and work towards A. E: [*], which is not an integer. D: [*] an integer. Once you find the answer, do not waste any time trying the other choices—they won’t work. document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>