____thecenterofourplanetarysystemwasconsideredasheresybythechurchintheMiddleAges.
A、ItisthesunandnottheearthB
【句意】 太阳系的中心是太阳而不是地球这一事实被中世纪的教会认为是异端邪说。
【难点】 That引导主语从句，全句的谓语是was considered.
Oneoftherequirementsforafireisthatthematerial____toitsburningtemperature.
Allofusknow,color-blindpeopleoftenfinditdifficultto__betweenblueandgreen.
Onnoaccount____everleavethebabyathomealone.
LastFridayIsawsomeboys______behindDaniel,_____thecomputergames.
GreatasNewtonwas,manyofhisideas____todayandarebeingmodifiedbytheworkofscientistsofourtime.
