求问两道prep08的阅读题，这篇简直在网上绝了迹了，完全找不到解释

Since the1850s researchers have tried to show that variations in seasonal weather areconnected in some ways with sunspots , the outward sign of an increase in theSun's activity. However, sciences lacked evidence supporting such a link untilthe mid-1980s, when van Loon and Labitzke compiled statistical evidencesuggesting that a link exists and that it involves winds in the upperatmosphere above the equator which reverse their direction from east to west orwest to east, every twelve to fifteen months. This phenomenon is called thequasi-biennial oscillation(QBO),and although meteorologists have known aboutthe QBO since the 1950s,until the 1980s no one recognized a subtle butstatistically significant link between the QBO and certain pattern of weather.When the west to east direction of winds in the upper atmosphere coincides withperiods of high solar activity that occur approximately every eleven years,winters in the eastern and central United States are very cold.

  On this basis, some meteorologists predictedthat the winter of 1988-1989 in the United States would be severe. However, thewinter was a mild one overall, and the meteorologists' attempt to make theconnection between the Sun and weather on the Earth appeared unsuccessful,until Barston and Liverzey proposed a hypothesis explaining why the predictionhad failed. They argued that the prediction had not taken into account anotherimportant element in the climate: the more or less regular pattern offluctuations in the temperature of the surface waters of the tropical PacificOcean.
Barston and Livezey noted that when the water temperature is abnormallyhigh-the phenomenon called EL Nino—the changes of cold winter weather overNorth American increase. The opposite situation, when surface temperatures arewell below normal—La Nina—is far less common. In fact, until late 1988 no onehad seen the combination of La Nina, westerly winds in the upper atmosphere,and high solar activity.

Thus,according to Barston and Livezey, La Nina cancelled out the effect of the othertwo climatic factors and caused the mild winter of 1988-1989.Although thishypothesis is plausible, much research remains to be done before meteorologistscan establish and explain the effects of increased solar activity on seasonalweather changes.

Q 1 ：Which of the following most accuratelydescribes the organization of the passage?

A. Ahypothesis is presented, a theory is constructed on the basis of thehypothesis, and then further research to expand the scope of the theory isproposed.

B.A hypothesis is presented, an example that contradicts it isdescribed, and then a hypothesis accounting for the apparent contradiction isproposed.

C. Twoopposing hypotheses are stated, and evidence confirming one of the hypothesesis considered.

D. Aphenomenon is described, a prediction about that phenomenon is made, andevidence confirming the accuracy of the prediction is presented.

E. A prediction about a phenomenon is detailed andevaluated, and evidence demonstrating the inaccuracy of the prediction ispresented.
------------------------------------------------------------------

Q 2.The passage provides information to support which of the followingstatement about La Nina?

A. Its occurrences is more likely to coincide with the periods of high solaractivity rather than low solar activity.
B. It is more likely to occur when the winds in the upper atmosphere above theequator are blowing from the west rather than from the east.
C. It occurs more frequently than do shifts in the winds in the upperatmosphere above the equator.
D. It occurs less frequently than does increased solaractivity.