Mary is from England, but _____ friend Jim isn't English. [ ]
A. she
B. her
C. he
D. his
答案:B
集气瓶内充满了某种气体,可能是氧气、氮气、空气中的一种.将燃着的木条伸入瓶中,木条火焰燃烧的更旺,则该气体可能是 [ ]
A.氮气
B.氧气
C.空气
D.三种都可以
下列不会出现咯血症状的是
A.血液病B.支气管扩张C.支气管肺癌D.肝硬化E.肺结核