Litchfield population (利奇菲尔德的人口)

2018-11-25

Planets（行星）

2018-11-25

Life cycle of frogs (青蛙)

2018-11-25

Apple trees(苹果树)

2018-11-25

Life cycle of frogs (青蛙彩色)

2018-11-25

Life cycle of frogs (青蛙灰色)

2018-11-25

Life cycle of flies(苍蝇)

2018-11-25

Joe’s fruit stand sales (乔伊的水果店)

2018-11-25

Average rainfall in Inches (平均降雨量)

2018-11-25

World illiteracy rate (世界文盲率)

2018-11-25

A school building (学校)

2018-11-25

City with at least 1,000,000 inhabitants in 2006 (大城市)

2018-11-25

Gdp per capita of all countries (世界gdp)

2018-11-25

Un human development report on literacy (世界读写能力报告)

2018-11-25

Person per square kilometers(占地面积)

2018-11-25

Different areas around the world (世界不同地区)

2018-11-25

The share of world gdp per capita (世界人均gdp份额)

2018-11-25

Change in potential cereal output (潜在谷物产量的变化)

2018-11-25

Air temperature around the world(世界气温)

2018-11-25

The precipitation changes (降水量的变化 )

2018-11-25