流程图可用来表示连续发生的一系列生理活动.以下流程图中正确的是( )
A:外界空气进入人体肺部:鼻→咽→喉→气管→支气管→肺
B:食物通过消化道:口腔→咽→食道→胃→大肠→小肠→肛门
C:完成反射活动过程:效应器→传入神经→神经中枢→传出神经→感受器
D:人体肺循环的过程:左心室→肺动脉→肺部毛细血管→肺静脉→右心房
Amy and her family ____ over the winter holiday.Hainan is ____ their home, so they went there ____. Sanya is a good place to visit. The weather is ____. The ____ is beautiful. Amy took lotsof pictures there. She ____ in the sea, too.
称取NaCl和BaCl2的固体混合物32.5g,加入100g蒸馏水,完全溶解后向该混合溶液中逐滴加入质量分数为10%的Na2SO4溶液,反应生成BaSO4沉淀的质量与所加入的Na2SO4溶液的质量关系如图所示.试回答下列问题:(提示:BaCl2+Na2SO4═BaSO4+↓+2NaCl)