以下哪一种因素容易引起误吸的发生()
A.妊娠
B.吸烟
C.恶病质
D.极度肥胖
E.食管裂孔疝
参考答案:B
Tell him _______ the window. [ ]
A. to shut not
B. not to shut
C. to not shut
D. not shut
—Where _____ the flowers?
—They are on the floor. [ ]
A. is
B. be
C. am
D. are