A．Because it was difficult to get the pictures and sound together.
B．Because the audiences liked the silent form.
C．Because the inventors and producers liked the silent form.
D．Because the inventors and producers had no money to marry the image withsound.
A．In 1890s.
B．In 1923.
C．In the early 1920s.
D．In 1903.
A．They invited some historians to introduce the local history.
B．Students could choose to write in pairs.
C．A third-grade teacher checked the special terms in their writing.
D．All the above.
A．Because she wanted to show what the stories were about.
B．Because this was the most interesting story the students has written.
C．Because she wanted to show that the stories were revised to be faithful to the history.
D．Because this was a famous event in the history.