______black—headed gulls(红嘴鸥) come to Kunming to spend their winter every year.
| A．Thousands | B．Thousands of |
| C．Thousand of | D．Thousand |
______black—headed gulls(红嘴鸥) come to Kunming to spend their winter every year.
| A．Thousands | B．Thousands of |
| C．Thousand of | D．Thousand |
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