根据下表提供的信息，你认为适合作滑动变阻器电阻丝的是____________ A

很多人认为事先做计划会很浪费时间，事实上，提前做好计划可以减少工作所用的总时间。行动之前先进行头脑热身，构想好要做之事的每个细节，梳理清楚思路，这样当我们行动时，便会得心应手。

A．细节决定成败

B．考虑问题要周到

C．行动离不开理论的指导

D．事先做好计划可提高工作效率

As we all know, the generation ____ makes it difficult for parents to understand their children's opinions. [ ]

A. division

B. gap

C. separation

D. interval

在针灸临床上补虚泻实原则的含义为（）。

A.虚则补之

B.实则泻之

C.宛陈则除之

D.陷下则灸之

E.不盛不虚以经取之

如图表示原始生命产生的化学变化过程，请分析回答：

无机小分子物质

A

有机小分子物质

B

有机大分子物质

C

原始生命

D

原始单细胞生物

（1）发生在原始大气中过程是______，此过程说明原始地球尽管不能形成生命，但能形成构成生命体的______．

（2）发生在原始海洋中的过程是______．

（3）最复杂、最有决定意义的阶段是______．

（4）上述过程说明原始生命是在地球温度下降以后，在极其漫长的时间内，由______经过极其复杂的化学过程一步一步地演变而成的．

Few creatures on earth are as cute as the black lion tamarin, and few have as dramatic a story line. Pug-nosed and diminutive, with a comic fringe of hair, these monkeys dwell in trees in small tracts of forest in southeastern Brazil. Or they did until 1905, when they were declared extinct. No one saw a black lion tamarin again in the wild until 1970. Later, in the 1990s, some Brazilian researchers turned up a small set of isolated, inbred populations scattered over a wide region. Since that time, they have been engineering tamarin migration, doing everything they can to save the world’s most distinctive primates.
Although they are no larger than house cats, tamarins have brains big for their size and a family life organized like our own. They live in groups anchored by an adult male andadult female, along with their offspring. When a mother bears young, she usually produces twins, and although members of the group share in their upbringing, it is most often the father who carries them around in the trees, where the families feed on fruits, insects and bird’s eggs.
Unhappily for the lion tamarins, their tree-bound niche began to disappear after the Portuguese landed in Brazil and began clearing forest to make room for Rio de Janeiro, the settlements and farms. As is the case for so many threatened species, the breakup of their habitat sounded the death knell for tamarins, depriving them of the continuity of forest they require to remain abundant and safe from potential threats in any single vicinity. The animals avoid predators by hardly ever coming down from the trees, so even a narrow logging road through a forest can begin the breakup by preventing them from moving from one patch of forest to another.
A simple solution was to build bridges across roads, allowing the monkeys to move from one forest to another. With some lumber and the researchers’ work, habitats that had been separated became continuous again, improving opportunities for migrating and mating.
The next step was to broaden the distribution of the population. The researchers captured two families of black lion tamarins and moved them to a new forest. After a year, the moves were declared a success: Not only had 80 percent of the tamarins survived, but they had also produced new offspring. So far, so good. The researchers had learned the animals could adjust to the new habitats, even if the insects there tasted a little different or the trees were a slightly different size.
The techniques for saving species in the wild vary. Species with less stringent habitat requirements, like wild turkeys, have been rescued by moving them into new settings as well as outlawing their killing. More challenging to preserve are species that require a lot of land, like elephants, and species that have highly specific requirements for habitat and prey -- like black-footed ferrets. Ultimately, as in all challenges, knowledge is power to save wild species from extinction.

The lumber bridges were devised to ______.

A. improve chances for tamarins to meet and mate
B. connect once separated habitats for the sake of research
C. make use of some lumber cut down
D. both A and C