单项选择题

Judging by the passage, biologist David Anderson ______.

A．seemed to be interested in marathon
B．made use of a satellite in his research
C．was probably a specialist in remote education
D．put together multimedia presentations for NSF
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单项选择题
The students in Louisiana ______.
A．worked together to find solutions to a problem over the Internet
B．cleaned up a polluted stream across their home town
C．received a grant of $ 50,000 for their project
D．lobbied the local and state political leaders
单项选择题
On which of the following assumptions is based the belief that tree-ring thickness shows links between solar periodicity and terrestrial climate
A．Solar-activity cycle existed in its present form during the period in question.
B．Average tree-ring thickness varies from species to species.
C．Tree-ring thickness varies with changes in terrestrial climate.
D．Both terrestrial climate 'and solar-activity cycle affect tree-ring thickness.
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