社会必要劳动时间随劳动生产率的变化而变化，这意味着
| A．社会劳动生产率越低，单位商品的社会必要劳动时间越多，单位商品价值量越大 |
| B．社会劳动生产率越高，单位商品的社会必要劳动时间越少，单位商品价值量不变 |
| C．社会劳动生产率越低，单位商品的社会必要劳动时间越少，单位商品价值量不变 |
| D．社会劳动生产率越低，单位商品的社会必要劳动时间越少，单位商品价值量越大 |
Have you read the book, ____ concerning the story of Song Dandan?
| A．it | B．one | C．which | D．the one |
When asked whether he could come over and have dinner with us, ____ .
| A．she said nothing | B．nothing was said by him |
| C．Tom nodded his head | D．they shook their heads |
No one believed his reason for being late ____ he was caught in a traffic jam, _____made him embarrassed.
| A．that; which | B．why; which | C．why; what | D．that; what |
—Will $ 1000 the cost of the trip?
—I’m afraid not, Perhaps I need another $ 400.
| A．pay | B．charge | C．cover | D．afford |
Last week he was caught robbing the bank opposite the station. ____his youth, the police have decided not to charge him.
| A．In spite of | B．In view of | C．In charge of | D．In case of |