Let's ask ___________ for help. [ ]
A. he
B. him
答案：B
Sarah hopes to become a friend of ________ shares her interests.
A．anyone
B．whom
C．whomever
D．whoever
一个无穷等比数列所有奇数项和为45，所有偶数项和为-30，则其首项a1=( )．
A．10
B．15
C．20
D．25
E．(E) 30
