尿液标本冷藏保存的时间做好不超过
A．2小时B．4小时C．6小时D．8小时E．10小时
参考答案：C
His English ________ a lot since he took the course.
A．improved
B．was improved
C．has improved
D．has been improved
已知某笔贷款年利率为12%，按季度计息，则该笔贷款的实际年利率是（）。
A．12.35%
B．12.55%
C．12.68%
D．12.93%
