No one _____ quite like you in the world. [ ]
A.am
B.is
C.are
D.be
牛奶中钠的含量是母乳的()
A.2倍
B.3倍
C.4倍
D.5倍
E.6倍
孔口的收缩系数ε为()。
A.0.62
B.0.97
C.0.75
D.0.64