1984年3月24日，福建省55位厂长经理在《福建日报》上发出“请给我们松绑”的呼吁 随后，《人民日报》转载了这封呼吁信，将“松绑”风吹向全国。这里的“松绑”主要是指

促进Ⅲ走廊可持续发展的措施是 （ ）

西方历史哲学家柯林伍德指出：“一切历史都是思想史。”在这里，柯林伍德强调的是

Why was the woman at the airport?

研究发两种方法虽然在化学理上都是可行的，但在实际应用中都存在很多问题，例如：（ ）。

①方法Ⅰ将受到地域的限制

②方法Ⅱ的能耗太大

③方法Ⅰ中使用的是氧化钙颗粒而不是氧化钙粉末

④方法Ⅱ中的物质可以循环利用，但方法Ⅰ中的却不能

What can we conclude from Stafford’s research?

植物异花传粉依传粉媒介的不同，可分2大类，即风媒传粉和虫媒传粉。( )

监测冰岛火山灰的扩散面积和浓度变化所利用的技术手段主要是（ ）

C

GUATEMALA CITY （Reuters） – A fish that lives in mangrove swamps（红树沼泽）across the Americas can live out of water for months at a time, similar to how animals adapted（适应）to land millions of years ago, a new study shows.

The Magrove Rivulus, a type of small killifish, lives in small pools of water in a certain type of empty nut or even old beer cans in the mangrove swamps of Belize, the United States and Brazil. When their living place dries up, they live on the land in logs（圆木），said Scott Taylor, a researcher at the Brevard Endangered Lands Program in Florida.

The fish, whose scientific name is Rivulus marmoratus, can grow as large as three inches. They group together in logs and breathe air through their skin until they can find water again.

The new scientific discovery came after a trip to Belize.

“We kicked over a log and the fish just came crowding out,” Taylor told Reuters in neighboring Guatgemala by telephone. He said he will make his study on the fish known to the public in an American magazine early next year.

In lab tests, Taylor said he found the fish can live up to 66 days out of water without eating.

Some other fish can live out of water for a short period of time. The walking catfish found in Southeast Asia can stay on land for hours at time, while lungfish found in Australia, Africa and South America can live out of water, but only in an inactive state. But no other known fish can be out of water as long as the Mangrove Rivulus and remain active, according to Patricia Wright, a biologist at Canada’s University of Guelph.

Further studies of the fish may tell how animals changed over time.

“These animals live in conditions similar to those that existed millions of years ago, when animals began making the transition（过渡）from water onto land,” Wright said.

49. The Mangrove Rivulus is a type of fish that _______.

由助细胞、反足细胞或极核发育成胚称( )。