（求救）高中英语单选1,Each number in the series 2-4-8-16 is twice as l

（求救）高中英语单选
1,Each number in the series 2-4-8-16 is twice as large as the ( ) number.
A previous D front
我选D但答案是A,
2,really?A MP3 player for $10 is real a bargain .Is it real ( )?
A yet Bstill C though D either
答案是C 选c怎么解释? “即使它是真的”?