中国大学MOOC: The Yellow River is at the estimated length of ______ kilometers; its total basin area is 742,443 square kilometers.

长江是世界上第三大河，全长 6,300 公里，流域面积 180 万平方公里。 ，is 6,300 kilometers long with a basin of 1.8 million square kilometers.

How long are the walking paths in Central Park A: 7 kilometers. B: 9 kilometers. C: 39 kilometers. D: 93 kilometers.

How far is it from here to the city A: 20 kilometers. B: 20.5 kilometers. C: 25.5 kilometers.

M: What’s the distance from here to the cityW: It’s about 25.5 kilometers. How far is it from here to the city() A: 20.5 kilometers. B: 20 kilometers. C: 25.5 kilometers.

Hong long is the Hong Kong-Zhuhai-Macao Bridge totally A: It is 5.5 kilometers long. B: It is 5 kilometers long. C: It is 55 kilometers long. D: It is 50 kilometers long.

What is the land area of China？ A: 9.0 millionsquare kilometers B: 9.4 million square kilometers C: 9.6 million square kilometers D: 9.2 million square kilometers

The city has an area of ________. A: 1580 cubic kilometers B: 1580 square meters C: 1580 square kilometers D: 1580 kilometers

The moon is ______ away from the earth. A: about 384 000 kilometers B: 240 000 kilometers C: only 348 000 kilometers D: about 384 000 meters

It covers a total area of nearly ________________ square kilometers.