Questions 21 and 22 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions.

How many painted wooden animals are fixed to the rotating platform（）

A. Neither the Greek soldiers nor their enemy could understand the messages.
B. African soldiers shouted from tower to tower to pass messages.
C. Using flags to send messages was found by a French engineer.
D. Only by using telephone could people send speech sounds quickly.

A. because weight is a fixed quality in an object.
B. because they are far away from the centre of the earth.
C. because of the earth’s strong attraction for them.
D. because they are not taken away from the surface of the earth.