The necessity for talking about "regrets" can be summarized as that ______.
The necessity for talking about "regrets" can be summarized as that ______.
A．regrets are very annoying for people
B．regrets are very wonderful for people
C．regrets are very common to people
D．regrets are very puzzling to people

A．U.S. is an immigration country respecting diversity
B．they are on behalf of the Democrats or Republicans
C．there is not much competition between newspapers
D．it is fun to be a reporter of old urban papers

A．Younger language learners’ learning capacity is almost the same as the older’s.
B．People’s language learning capacity is biologically determined.
C．There is no critical period for second-language learning.
D．Both older and younger learners have their advantages and disadvantages.