She says she wants _ young and beautiful.
A:is
B:are
C:to be
D:am
某地区今年参加初中毕业学业考试的九年级考生人数为31000人,数据31000人用科学记数法表示为____人.
(2015•烟台)如图,BD是菱形ABCD的对角线,CE⊥AB交于点E,交BD于点F,且点E是AB中点,则tan∠BFE的值是( )