下列哪项是雌激素的生理功能()。A．使子宫肌肉松弛 B．使子宫内膜由增生期变为分泌期

It’s not only humans that flourish in large settlements. Some ants find urban life so accommodating that their populations explode and they form supercolonies in cities.

"One of the most common house ant species might have been built for living in some of the smallest spaces in a forest, but the ants have found ways to take advantage of the comforts of city living," Purdue University said in a statement. Grzegorz Buczkowski, a Purdue University research assistant professor of entomology, discovered odorous house ants live in supercolonies, creating complex networks entomologists have never seen with the species before now. He found that odorous house ant colonies become larger and more complex as they move from forest to city and act somewhat like an invasive species, the university said. "The ants live about 50 to a colony with one queen in forest settings but explode into supercolonies with more than 6 million workers and 50 000 queens in urban areas," the university explained.

"This is a native species that’s doing this," said Buczkowski, whose results are published in the early online version of the journal Biological Invasions. "Native ants are not supposed to become invasive. We don’t know of any other native ants that are outcompeting other species of native ants like these," Buczkowski said. Odorous house ants live in hollow acorn shells in the forest. They’re called odorous because they have a coconut (椰子)-or rum-like smell when crushed. They’re considered one of the most common house ants, Purdue said. In semi-natural areas that are a cross of forest and urban areas, such as a park, Buczkowski said he observed colonies of about 500 workers with a single queen. "It’s possible that as the ants get closer to urban areas they have easier access to food, shelter and other resources," he said.

"In the forest, they have to compete for food and nesting sites," Buczkowski said. "In the cities, they don’t have that competition. People give them a place to nest, food to eat. " Buczkowski observed the ants in three different settings on and around the Purdue campus. He said it might be expected that if the odorous house ants were able to multiply into complex colonies, other ants would do the same. But Buczkowski found no evidence that other ants had adapted to new environments and evolved into larger groups as the odorous house ants have, Purdie said. "It’s possible that odorous house ants are better adapted to city environments than other ant species or that they had somehow outcompeted or dominated other species," he said. "This raises a lot of questions we’d like to answer. " Buczkowski said understanding why the supercolonies form could lead to better control of the pests in homes, as well as ensuring that they don’t outcompete beneficial species.

Future studies on odorous house ants will include studying the ant’s genetics and trying to understand the effects of urbanization of odorous house ants, Purdue said.

According to the third paragraph, native ants are （）

A. liable to become aggressive

B. not prone to be offensive

C. able to outcompete other ants

D. easily attacked by other ants

男，36岁，右股动脉刺破造成大出血，压迫止血2小时，查体脉搏110次/分，血压85/70mmHg，该病人进一步的处理哪些是正确的

A．静脉注射多巴胺

B．输血补充血容量

C．静脉滴注碳酸氢钠

D．继续压迫，输注血管收缩剂

E．争取尽快修补股动脉

李小姐可负担的首付款为( )万元。

A．48.34

B．45.20

C．44.48

D．38.59

这个标志是何含义？（）

A．靠道路右侧停车

B．只准向右转弯

C．右侧是下坡路段

D．靠右侧道路行驶

国家决定在城乡全面实行收费公示制度，按照规定审批权限和程序制定的行政事业性收费均应实行公示制度，公示制度可采取设立公示栏、公示牌、价目表（册）或电子显示屏、电子触摸屏等方式。请问，县级以上城市在什么时间以前要完成收费公示栏的设立工作。