相关考题
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单项选择题
The Latino population is changing Arizona’s（）.
A．aging problem
B．educational system
C．economic structure
D．financial deficits -
单项选择题
It seems to shine unchangingly, pouring out a constant light year after year. But the sun may not be nearly so stable as we suppose. It is now thought to move quickly and irregularly and change in long-term cycles, growing dimmer and then brighter with each passing year. Some even fear that its frequent changing behavior. would have a great influence on the Earth' s climate. The source of the sun' s inconstancy is magnetism. Professor William Livingston has developed new theories about its magnetic nature. 'We don' t yet know what causes sun spots, 'he says, 'but we now think they ' re areas of high level magnetism that come up from the sun' s interior. So strong is their magnetic pull that the highly ionized gas nearby is not able to transmit energy out. 'As a result these areas send out less heat and light and thus appear from Earth to be almost dark irregular surface patches. Sun spot activity generally fluctuates in steady, 11-year cycled. Scientists have long formed the o pinion that as the size and number of sun spots increased, the overall energy sent out by the sun would de crease. Indeed, recent studies confirmed it, revealing that during peak periods of sun spot activity, the Earth experiences a small drop that can be seen clearly in received solar energy. Could such a small drop in energy have an effect here on earth? Perhaps some scientists think the world temperature could fall by' as much as 0.2 during periods of high solar magnetism.., enough to cause significant fluctuations in weather patterns.According to the passage, it is believed that the sun ______ ．A．moves in a quick but steady way year after yearB．sends out less and less heat and light with each passing yearC．radiates the same amount of light every yearD．might have a strong influence on the weather patterns
A.
B.
C.
D.
E.2
F..,
G.
According
H.
A．moves
I.sends
J.radiates
K.might -
单项选择题
In the seventeenth century, European soldiers who came across some Indian groups in the western Great Lakes found that several native tribes were living in the area without a formal leadership system. They appeared to be 'quite friendly with each other without a formal authority!' Not only did the Indians appear to lack a formal system of authority, but they also deeply hated any efforts to control their actions. All members of the tribes knew what was required of them by life long familiarity with the tasks of the area. These tasks tended to be simple, since the Indian' s rate of social change was slow. Thus, although subgroups such as soldiers had recognized leaders, no real authority was required. Rather than giving direct orders (which were considered rough), members of the tribes would a- rouse others to action by examples. It would be difficult, if not impossible, to carry out such a system in our own society. Most of us have grown up under 6ne authority or another for as we can remember. Our parents, our teachers, our bosses, our government all have the recognized fight under certain conditions to tell us what to do. The authority is so much a part of our culture that it is hard for us to imagine a workable society without it. We have been used to relying on authority to get things done and would probably be uncomfortable with the Indian methods of examples on a large scale. Of course, the major reason why the Indian system would not be suitable for us is that our society is too large. The number of tasks that various members of our society have to perform. often under tight time and resource limitations could not be treated by the Indian system. In modern societies, the formal authority system is necessary to achieve any social objectives.Which of the following sentences is correct according to the passage?A．From 1710 to 1780, European soldiers came across some Indian groups in the western Great Lakes.B．European soldiers were quite friendly to the Indian groups.C．The Indian groups had no leaders.D．The Indian groups only obeyed their own gods.
A.
B.
C.
Which
D.From
E.
B．European
F.
C．The
G.
D．The
H.
