Scientists think that there has been life on Earth for _______ years.       
#51626
A
illions     
B
millions of
C
illion of
D
illion
推荐题目
--It’s said that __________ people died from car accidents in 2011. --How terrible! 
#51646
A
10 thousands
B
thousand of
C
10 thousands of
D
thousands of
 –Good news. We will have a ______ holiday.--I’ve heard of it. But it’s coming in_______.
#50892
A
three days, here days’ time
B
three days’, three days’
C
three-day, three days
D
three days, three-day time
There are ______visitors in Hangzhou every year.
#51629
A
million of
B
millions of
C
million
D
milliones of