出生率
参考答案：
又称粗生率，是指某一人口在一定时期内（通常是1年）活产婴儿数与同期总人口的生存人年数之比一般用千分比表示。
第二节．短文改错 （共10分）
At Christmas Eve, Jim went with his 91.__________
father to choose a Christmas tree. They choose 92. ___________.
A big one.It was almost as taller as the room! 93.___________.
They put them in the corner of the sitting 94.___________.
room. Kate was covered it with a lot of 95.___________.
Christmas light. The sitting room looked 96.____________.
really beautifully at the moment. There was 97.____________.
a fire burning in the fire place, but the Chistmas 98. ____________.
tree lights were shinning brightly. Jim and his 99._____________
parents singing and dancing happily. 100._____________
红、蓝两队进行拔河比赛，规定只有将中间的标线拉到自己一方2米处才能获胜。每5秒钟红队拉过0.4米，蓝队拉过0.6米。请问，经过多久才能决出胜负( )
A．30—35秒 B．35—40秒C．45—50秒 D．50—55秒
