单项选择题

Captain Sentry, in this passage, demonstrates that he is noteworthy because of his ______.

A．domineering quality
B．modesty
C．honesty
D．frankness
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单项选择题
We need to know something about the structure and operation of science because ______.
A．it is not easy to understand the things that excite and frustrate science
B．science affects almost every aspect of our life
C．scientists live in a specific substructure
D．it is easier to understand general characteristics of science
单项选择题
The passage suggests that if there were a slight global warming at the present time, it would be ______.
A．easy to measure the exact increase in temperature because of the abundances of temperature recording stations throughout the world
B．difficult to prove that the warming was caused by the burning of fossil fuels
C．easy to demonstrate the effects of the warming on the water vapor in the atmosphere
D．difficult to measure the increase of CO2 in the atmosphere because of local variations in amount
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