14．
Humans are mammals（哺乳动物）．Most mammals are born able to do many things．
Some can walk within a few minutes of being born．They have to be able to run away if（16）Bis near．But human babies are born（17）D．They need the care of adults to live．
In the first month of life，babies cannot smile or sit up．They cannot even hold up their own heads（18）Csome help from grown-ups．
In the next few months，babies grow a lot．They learn to roll over，support their heads，and 19Asit up while being held．
Babies also have to learn to use their（20）D．It takes months for them to learn to reach for objects．At around six months old many babies can（21）Ban object from one hand to another．
Babbling is（22）Ba human baby learns to speak．Babies all seem to make similar
sounds by babbling．They try to imitate （模仿） the sounds they hear from adults．It will take about nine months（23）Aa baby can say real words．
Somewhere around a baby's first birthday he or she may stand or walk with help．Soon
the baby will（24）Caround on his or her own!
The first year of a baby's life is a time of growing and（25）D．Growing sure takes a lot
of work!
| 16．A．food | B．danger | C．waste | D．peace |
| 17．A．careless | B．harmless | C．hopeless | D．helpless |
| 18．A．of | B．for | C．without | D．by |
| 19．A．even | B．never | C．ever | D．still |
| 20．A．legs | B．heads | C．eyes | D．hands |
| 21．A．keep | B．move | C．hold | D．make |
| 22．A．why | B．how | C．which | D．where |
| 23．A．before | Bsince | C．after | D．while |
| 24．A．look | B．show | C．run | D．sit |
| 20．A．speaking | B．smiling | C．crying | D．learning． |
