单项选择题

Questions 17-20 are based on the following talk about tidal wave. Which of the four statements is true of tidal wave

A．It is the regular rise and fall of ocean waters.
B．It comes at definite times of each day.
C．It comes rushing in suddenly and unexpectedly.
D．Scientists can hold back a tidal wave.
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When do children first begin to make language-like noises
单项选择题
What was the underlying significance of the invention of the Kodak
A．It made the work of professionals more enjoyable.
B．It made picture-taking suddenly popular among ordinary people.
C．It marked the beginning of manufacturing small cameras.
D．It met the need of photographers in America and Europe.
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