细胞外液的主要阳离子是?()
A. Na+
B. K+
C. OH-
D. Ca2+
E. Mg2+
plight()
A.work hard
B.serious and difficult situation or condition
C.crumbling
They daren’t ask for they are afraid _____.
A.of laughing at
B.to be laughed
C.of being laughed at
D.have been treated
commit()
A. to do (something wrong)
B. to do (something right)
C. to admit