What does not belong to the studying method taken by scientists？
A. They bury measuring device 3 kilometers under the volcano floor.
B. They observe carefully the change of the mountain's position.
C. They also observe activities of the earth when it changes.
Devices are placed within 20 kilometers of Mount St．Helens.
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Seeing that there is a claim about German economic might, it is somewhat surprising how relatively small the German economy actually is.
A. To give
B. Given
C. Giving
D. Having given
All of them ridiculed my suggestion.
A. laughed at
B. accepted
C. disagreed with
D. discouraged
How long may an explosion of Mount St．Helens last？
About a month.
B. No more than a year.
C. Three or four weeks.
D. There is no definite answer from the scientists.
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