单项选择题

What is the author's attitude to the "gloomy forecast"

A．Optimistic.
B．Pessimistic.
C．Indifferent.
D．Not mentioned.
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单项选择题
According to Dr. Rascool, the effective solution to the unfavorable forecast is______.
A．to reduce the carbon dioxide content of the atmosphere
B．to decrease the collections of aerosols in the air
C．to substitute favorable fuel for the present type
D．to adopt some effective measures to destroy the aerosol layer
单项选择题
The finds of Geoffrey Marcy are frightening in that______.
A．it's the first time that astronomers have discovered such space entity
B．it substantially implies some kind of subversion to our present realization
C．it is an entire negation of the present astronomic research
D．they discovered the first extra-solar planet in astronomic study
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