TOEFL Reading: ETS-TOEFL阅读机经 - 3T641PKY83U5CP6YL$

According to paragraph 1, which of the following was NOT true of lower Mesopotamia before 4500 B.C.? A. It was flooded every year by rivers. B. Its soil was unsuitable for Stone Age hoe culture agriculture. C. It was comparatively dense in population. D. It had few trees