题目

Charles Darwin was a scientist who changed our understanding of the natural world. He is known _______ the Father of Modern Biology. Darwin spent all his life _______ nature and making notes about all the species (物种) he found.Darwin was born in 1809 in England. Like many geniuses (天才), he didn’t do well at school and got _______ marks. He was a good athlete though and loved exploring nature and collecting sea shells. His father was a doctor and expected Charles _______ one too. Charles started studying medicine at Edinburgh University, but soon gave up his studies there.In 1831, ___6、已知△ABC的三边长度分别为6cm，8cm，10cm，则连接各边中点所成△DEF的周长为12cm，△DEF的面积为6cm2．