有效教学中所讲的教学成本是指物质成本与（） A．时间成本 B．精神成本 C．空间成本

早在1910 年，晚清小说家陆士谔创作完成了一部充满幻想的小说《新中国》，小说写道，将来在中国上海要召开一个万国博览会。中外游客都要到我们上海来，百年之前的“预言”，竟神奇地应验了。这表明：[ ]

①意识不仅反映世界，而且能够通过实践改造世界

②意识怎样幻想世界，世界就会发生怎样的变化

③意识因其创造性，而具有直接现实性

④意识因其能动性，而可以成为实践的先导

A．①②        

B．②③        

C．①④      

D．②④

The car is ________ expensive _______ he can’t buy it.

A．too; to

B．so; that

C．such; that

D．enough; that

行政道德的基本功能有（）。

A、规范与约束功能 

B、教育与塑造功能 

C、调节功能 

D、激励功能 

E、限制功能

现券买卖市场哪种交易方式的成交扣减对手方限额？（）

A、询价交易方式

B、点击成交交易方式

C、都受控制

D、都不受控制

Clinical depression is a serious ailment, but almost everyone gets mildly depressed from time to time. Randolph Nesse, a psychologist and researcher in evolutionary medicine at the University of Michigan, likens the relationship between mild and clinical depression to the one between normal and chronic pain. (46)He sees both pain and low mood as warning mechanisms and thinks that, just as understanding chronic pain means first understanding normal pain, so understanding clinical depression means understanding mild depression.

Dr. Nesse’s hypothesis is that, as pain stops you doing damaging physical things, so low mood stops you doing damaging mental ones — in particular, pursuing unreachable goals. Pursuing such goals is a waste of energy and resources. (47)Therefore, he argues, there is likely to be an evolved mechanism that identifies certain goals as unattainable and inhibits their pursuit — and he believes that low mood is at least part of that mechanism.

It is a neat hypothesis, but is it true？A study published in this month’s issue of the Journal of Personality and Social Psychology suggests it might be. Carsten Wrosch from Concordia University in Montreal and Gregory Miller of the University of British Columbia studied depression in teenage girls. Their conclusion was that those who experienced mild depressive symptoms could, indeed, disengage more easily from unreachable goals. That supports Dr. Nesse’s hypothesis. (48)But the new study also found a remarkable corollary: those girls who could disengage from the unattainable proved less likely to suffer more serious depression in the long run.

Mild depressive symptoms can therefore be seen as a natural part of dealing with failure in young adulthood. (49)They set in when a goal is identified as unreachable and lead to a decline in motivation, and in this period of low motivation, energy is saved and new goals can be found. If this mechanism does not function properly, though, severe depression can be the consequence.

Dr. Nesse believes that persistence is a reason for the exceptional level of clinical depression in America— the country that has the highest depression rate-in the world. (50)”Persistence is part of the American way of life, ” he says. “People here are often driven to pursue overly ambitious goals, which then can lead to depression. ” He admits that this is still an unproven hypothesis, but it is one worth considering. Depression may turn out to he an inevitable price of living in a dynamic society.

(49)They set in when a goal is identified as unreachable and lead to a decline in motivation, and in this period of low motivation, energy is saved and new goals can be found.