China has a history of over 5，000 years． It is one of the ________ countries in the world．（ ）
| A． |
biggest |
B． |
richest |
C． |
oldest |
China has a history of over 5，000 years． It is one of the ________ countries in the world．（ ）
| A． |
biggest |
B． |
richest |
C． |
oldest |
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