上海世博会用于文化演艺娱乐活动的场地总共有()余个,约占到园区总面积的10%。
A.30
B.40
C.50
参考答案:A
以下哪些骨肿瘤常见钙化()
A.骨瘤
B.骨肉瘤
C.骨巨细胞瘤
D.软骨瘤
E.软骨肉瘤
Fragments of charred antelope bone have recently been found at a million-year-old settlement of Homo erectus, an early human species. This discovery demonstrates that humans were making controlled use of fire to cook meat at a very early stage of their development. The argument above makes which of the following assumptions
A.Every human species since Homo erectus has made controlled use of fire.
B.Homo erectus could not have eaten antelope meat unless the meat had been cooked.
C.Early human settlements can be identified by the presence of charred antelope bones.
D.The diet of Homo erectus consisted in large part of antelope meat.
E.(E) The antelope bones were charred in a fire controlled by humans.