单项选择题

Questions 17-20 are based on the following talk about tidal wave. What is the use of a seismograph

A．it is used to record the strength of an earthquake or seaquake.
B．it is used to record the direction of an earthquake or seaquake.
C．It is used to record the length of time of an earthquake or seaquake.
D．It is used to predict when a tidal wave will hit land.
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单项选择题
Snapshot, as is explained in the passage, refers to
A．the shooting of birds by hunters.
B．the whole process of taking pictures.
C．pictures taken at random.
D．pictures that were taken after careful preparation.
单项选择题
The writer suggests that there might be more agricultural advancements if
A．government put up fewer obstacles.
B．there was a green revolution.
C．there were better seeds and methods of farming.
D．there were more technological advances.
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