GMAT考试Testprep数学精解_GMAT数学

GMAT考试Testprep数学精解

　　Quantifiers

　　all except likely

　　some most many

　　only could no

　　never always everywhere

　　probably must alone

　　Example：

　　Whether the world is Euclidean or non-Euclidean is still an open question.

　　However， if a stars position is predicted based on non-Euclidean geometry，then when a telescope is pointed toswheresthe star should be it will be there. Whereas， if the stars position is predicted based on Euclidean geometry，then when a telescope is pointed toswheresthe star should be it wont be there. This strongly indicates that the world is non-Euclidean.

　　Which one of the following best expresses the main idea of the passage?

　　 The world may or may not be Euclidean.

　　 The world is probably non-Euclidean.

　　 The world is non-Euclidean.

　　 The world is Euclidean.

　　 The world is neither Euclidean nor non-Euclidean.

　　Choice understates the main idea. Although the opening to the passage states that we dont know whether the world is non-Euclidean， the author goes　on to give evidence that it is non-Euclidean. Choice overstates the main　idea. The author doesnt say that the world is non-Euclidean， just that evidence strongly indicates that it is. In choice ， the word probably properly limits the scope of the main idea， namely， that the world is probably non-Euclidean， but we cant yet state so definitively. The answer is 。