What kind of structure is the sentence “The girl showed her classmates some of her family photos.”?
A:S+V+O
B:S+V+P
C:S+V+IO+DO
D:S+V+DO+OC
下列物质中,属于合成纤维的是( )
如图中,A﹣﹣E示意人体的不同结构层次,请据图分析回答下列问题.
—Please you leave nothing here.
鸡兔同笼,上数有20个头,下数有50条腿,可知鸡和兔数量分别为( )