在伤寒的流行病学上具有重要意义的是
A．伤寒患者的潜伏期
B．伤寒患者
C．伤寒暂时性带菌者
D．伤寒慢性带菌者
E．伤寒恢复期患者
参考答案：D
His wife spent too much money _____ the villa.
A．in
B．with
C．on
D．to
The official ________ to say more about the plan, so the details of it remain secret.
A．agreed
B．declined
C．attempted
D．declared
