______, he makes little progress. So he is trying new methods of study. Which of the following is

WRONG?[ ]

A．Hard as he works

B．Hard although he works

C．Hard though he works

D．Although he works hard

在世界饭店业发展史上，大饭店时期的饭店特征是______。

A．讲究礼仪

B．价格合理

C．规模宏大

D．设施豪华

E．装饰讲究