单项选择题在曲型生长曲线中，细胞形态最不规则的时期是（ ）。 A、延滞期 B、指数期 C、稳定期 D、衰亡期
单项选择题Task 1 Complete each statement by choosing the appropriate answer from the four choices marked A, B, C and D. As her private secretary he has to all her letters. A、accent B、account C、access D、accident
