7-C. However, citizen science projects are burgeoning more than ever: over 60 of them were mentioned at a meeting of the Ecological Society of America not long ago.However, citizen science projects are burgeoning more than ever: over 60 of them were mentioned at a meeting of the Ecological Society of America not long ago.
8-C. The base-60 system did not appear in human history until recently.The base-60 system did not appear in human history until recently.
60進法は、現れなかった、人類の歴史にダヨ、最近までダヨ。
9-C. Ancient Mesopotamians believed the base-60 system was unusual.Ancient Mesopotamians believed the base-60 system was unusual.
古代のメソポタミア人は、信じていた、60進法が普通でなかった(時制の一致)とダヨ。
10-C. In paragraph (2,) the author tells us that the base-60 system is highly convenient for measuring time .In paragraph (2,) the author tells us that the base-60 system is highly convenient for measuring time .
11-C. Those aged 35 to 44 increased by 9% , as did people in their late 50s to early 60s.Those aged 35 to 44 increased by 9% , as did people in their late 50s to early 60s.