1编号：4814题型：单选题测试正确率：47.97%
As everybody knows, diamond is .
2编号：4813题型：单选题测试正确率：40.95%
She is an doctor.
3编号：4811题型：单选题测试正确率：34.6%
There are students on the playground.
4编号：4810题型：单选题测试正确率：47.88%
India is a country.
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