Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage. We can infer that ______ environments help develop a person’s intelligence.

A．Someone spilled water on it.
B．Someone lost it.
C．It was made of low quality metal.
D．The standard for measuring had changed.

A．Tile elders must give approval to perform sacred dances.
B．The elders make sure the dances are performed properly.
C．The troupe is financed by the elders.
D．The elders have substantial acting experience.