TOEFL Reading: ETS-TOEFL阅读机经 - GU21TY78B34Q677AL$

The purpose of paragraph 6 is to A. answer questions about the equipment and techniques used in the Egyptian Delta area B. describe the earliest communities built on large, sand-and-gravel mounds C. explain how streams feeding the Nile River in the delta change course over time D. provide an example of a situation where complex geoarchaeological analyses and techniques are necessary