某女，35岁，甲状腺功能亢进患者。在其血液中下列哪一种物质的浓度降低
A．血钙
B．葡萄糖
C．胆固醇
D．氨基酸
E．尿酸
参考答案：C
They went to the park yesterday, _____? [ ]
A. don't they
B. didn't they
C. aren't they
D. can't they
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