She will stop showing off __________________ (如果没有人把注意力放到她身上).

A．Because the card has a credit limit.
B．Because the bank will offer an extra amount of money.
C．Because obtaining this kind of card is becoming much easier.
D．Because other kinds of cards will have higher interest rates and higher penalties.

A．The two layers of polymers are charged differently.
B．The empty capsule they designed is used to trap mouse.
C．The absorbed-light can kill bacteria inside the capsule directly.
D．Singlet oxygen is an insulated form of element.