单项选择题

The Chickscope Project enabled students to do all of the following EXCEPT ______.

A．to set up an incubator to hatch chicks
B．to actually operate an MRI system
C．to get involved in actual research
D．to watch the changes in the chick embryo

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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 treering thickness.

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