Which is the TRUE statement about the collectorA．T

单项选择题

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.

Which is the TRUE statement about the collector

A．The collector is made of several kinds of sheets.
B．The collector is placed on the water.
C．The collector is made of corrugated sheets.
D．Not mentioned in the passag