单项选择题

Sialic material refers to______.

A．the broken ,rock resulting from the impact of a meteorite against the earth
B．material that exists on planets other than the earth
C．a composite of rock typical of continental areas of the earth
D．material that is man-made to simulate materials that existed far back in geological history
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单项选择题
In asserting that the organic model might be more serviceable to the restoratioulsts (Para. 3), the author implies that______.
A．the descriptions by Turner and Jordan of the restorationists program conform more closely to the organic model than to the community-participation model
B．the organic model is more consistent than the community-participation model with the principle of restoration
C．the organic model is more consistent with the restorationists' agenda than with the preservationists' program
D．holistic models are more useful to the restorationists than is the dualist model
单项选择题
A mare basin is______.
A．a formula for determining the relationship between the depth and width of craters
B．a valley that is filled in when a spatial body has impact with the moon or the earth
C．a planetoid(small planet)created when a meteorite, upon striking the moon, breaks off a Part of the moon
D．a dark spot on the moon, once supposed to be a sea, now a plain
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