补全短文
greatly too very A. the number of births 【T1】______exceeds B. has a 【T2】______marked effect on the available workforce C. of those 【T3】______old to work Although the size of the workforce depends a great deal on the size of the total population , there are several other influences which also affect it. The age distribution of the total population 【T4】______. If the population has a high proportion of very young people or 【T5】______, then the available workforce would be lower than if there were an evenly spread age distribution. If the population grows rapidly from natural increase, i.e. 【T6】______ the number of deaths, then as the total population increases, the proportion in the workforce declines.