题目

“Now! whispered Suki．“Quick, while the clerk's not looking．Heart pounding, Leah slid two tubes of lipstick into her purse． She looked bored as she followed her friends Suki and Jill out of the store, but inside she felt panicked．I can't believe you made me do that, Leah cried．Relax, said Jill． Everybody does it sometimes． And we didn't make you do it．She said nothing, but Leah knew she wouldn't have done that on her own． She was justexperiencing huge peer  （同伴）  pressure．Sometimes, though, the stresses in your life can actually come from your peers． They may（2007•东城区二模）树叶上有许多气孔，在阳光下，一个气孔在一秒钟内能吸收2500000000000个二氧化碳分子，用科学记数法表示正确的是（　　）A．2.5×1010B．2.5×1011C．25×1011D．2.5×1012