心脏后前位x线片左心缘出现四段,第三段向外凸出是( )
A.左心室增大
B.右心室增大
C.左心耳增大
D.右心房增大
E.全心增大
参考答案:C
— Where is Mr Green?
— He ____ Jane with her English in the teachers' office. [ ]
A. has helped
B. is helping
C. helps
D. will help
下列食物中,含有的主要营养成分不是蛋白质的是
A.全麦面包
B.鱼虾
C.豆腐
D.奶酪