[单项选择]How does the weather affect the growth of a tree
A. Plenty of sunlight and rainfall will limit the growth of a tree.
B. A tree grows best with little sunlight and rain.
C. Some trees provide an exact record of the weather.
D. The weather determined the pattern of rings in a tree trunk.

[单项选择]How exactly, does science work How do scientists go about doing science Ordinarily we think science proceeds in a straight-forward way. Ideally scientists make observations, formulate hypotheses (假设), and test those hypotheses by making further observations. When there is difference between what is observed and what is predicted by the hypothesis, the hypothesis is revised. Science proceeds in this way, which is a gradual method of finding the best fit between observation and prediction.
But this idealized version of how one does science is naive. Although science demands proof that observations made by one observer be observable by other observers using the same methods, it is by no means dear that, even when confronted with identical phenomena, different observers will report identical observations. And it is most certain that, even if the same observations are made, the conclusions as to the meaning of the observations frequently differ.
The fact is that all of us, s
A. The research methods used by scientists.
B. Observation and human perception variation.
C. The relation between hypothesis and observation.
D. The human perceptual mechanism.

[单项选择]How exactly, does science work How do scientists go about doing science Ordinarily we think science proceeds in a straight-forward way. Ideally scientists make observations, formulate hypotheses (假设), and test those hypotheses by making further observations. When there is difference between what is observed and what is predicted by the hypothesis, the hypothesis is revised. Science proceeds in this way, which is a gradual method of finding the best fit between observation and prediction.
But this idealized version of how one does science is naive. Although science demands proof that observations made by one observer be observable by other observers using the same methods, it is by no means clear that, even when confronted with identical phenomena, different observers will report identical observations. And it is most certain that, even if the same observations are made, the conclusions as to the meaning of the observations frequently differ.
The fact is that all of us, scient
A. The research methods used by scientists.
B. Observation and human perception variation.
C. The relation between hypothesis and observation.
D. The human perceptual mechanism.

[单项选择]How does Susan feel
A. Satisfied.
B. Happy.
C. Tired.
D. Discouraged.

[单项选择]How does acupuncture work
A. It works on rheumatism.
B. It works on blood.
C. It works on arms and legs.
D. It works on energy balance.

[单项选择] Does Economic Growth Improve Human Morale During the mid-1980s my family and I spent a sabbatical year in the historic town of St. Andrews, Scotland. Comparing life there with life in America, we were impressed by a seeming disconnection between national wealth and well-being. To most Americans, Scottish life would have seemed Spartan (清贫的) . Incomes were about half that in the U. S. Among families in the Kingdom of Fife surrounding St. Andrews, 44 percent did not own a car, and we never met a family that owned two. Central heating in this place not far south of Iceland was, at that time, still a luxury. In hundreds of conversations during our year there and during three half-summer stays since, we repeatedly noticed that, despite their simpler living, the Scots appeared no less joyful than Americans. We heard complaints about Margaret Thatcher, but never about being underpaid or unable to afford wants. With less money there was no less satisfaction with living,
A. Y
B. N
C. NG