The    of the students in our class     girls.

A．majority, are

B．most, are

C．majorities, are

D．majority, is

预防腰麻时血压降低宜用

A．异丙肾上腺素
B．多巴胺
C．肾上腺素
D．去甲肾上腺素
E．麻黄碱