题目

阅读下面短文，掌握其大意，然后从16~35各题所给的A、B、C、D四个选项中，选出最佳选项。 I was ready to pay for my bananas at the grocery one night，when fear seized me. My wallet was gone. I could only have left it on the G9 bus，which was now speeding in the dark to some      16    station. The    17   moment was quickly followed by mental math. How much time and money would it cost to replace the    18    of that little wallet？The credit cards，the driver's license，the cash，all lost to the bus. Two hours later，back at my下列对凋亡的叙述和理解不正确的是：（　　） A．蝌蚪在变态期，尾部细胞将发生凋亡，从而使其能转变成正常的成体蛙 B．细胞的凋亡有助于消除体内衰老的细胞 C．细胞的死亡是由基因所决定的细胞自动结束生命的过程 D．细胞的自然更新、被病原体感染的细胞的清除，也是通过细胞调亡完成的。