4

Long long ago， people had gather leaves and 56._____

fruit of plants to eat with. They didn’t know how 57. _____

to plant crops or how to keep animals for their 58. _____

food. We call them Stone Age people. Thing for 59. _____

them were terrible and hard. Now there have still 60. _____

some people living liked those Stone Age people. 61. _____

They live in places that are hard reach. They do 62. _____

not know of our invention， for they keep themselves 63. _____

away our civilized world. For many years 64. _____

a group of people call Aruntas have lived alone 65. _____

in the center of Australia.

5

How robins(知更鸟) know when it is time 56._____

to go back north? They seem to tell by how

soon daylight lasts. In late winter， daylight 57. _____

begins to last longest each day. When the 58. _____

daylight lasts long enough， robins start north. 59. _____

They fly by day. Each year they follow a same 60. _____

fly-way. At first， they fly only few miles a 61. _____

day. They stop often in the field to eat bugs 62. _____

(小虫子). Late， they seem in a hurry. They fly 63. _____

over 100 miles a day. Some are going so far 64._____

as 180 miles. When they get to home， they 65. _____

always stay together high in a tree.

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