The first plants___(exist) out of the water were知识点相关讲解 应该用existing,这里的exist不是整个句子的谓语,而是作为解释the first plants 的部分,可以理解为表示修饰,用非谓语动词形式,而植物是自己存在的,不是“被”存在,那么就应该用主动形式,即existing —— angelruc exist 植物存在是自然的不需要过去...
(2)A.根据后句"First,they grew plants in two plastic houses connected by a tube (管子).One plant was bitten by insects.The other was not.首先,他们在两个用管子连接的塑料房子里种植植物。其中一种植物被昆虫咬了。另一个则不然。"可知说的是实验观察,结合选项,应说科学家们观察了被昆虫咬伤的...
For example, sound can tell them that the plant is stressed and not good for laying eggs on. When wants to eat plants, it can also use sound to choose which one to eat.The scientists also listened to other plants such as wheat and corn. They also make sounds when stressed The study ...
000 years ago—the peak of the last ice age.The plants were preserved under a thick ash fall from a volcanic eruption.Investigations of the plants found grasses, sedges, mosses, and many other varieties in a nearly continuous cover, as was predicted by Guthrie.But this vegetation had a ...
The first was the discovery of a 1,000-square-kilometer preserved patch of Beringian vegetation dating to just over 17,000 years ago—the peak of the last ice age. The plants were preserved under a thick ash fall from a volcanic eruption. Investigations of the plants found grasses, s...
The task John set for himself was to remove harmful substances from some sludge (污泥). First, he constructed a series of clear fiberglass tanks connected to each other. Then he went around to local ponds and streams and brought back some plants and animals. He placed them in the tanks ...
阅读理解 "Plants were expected to get larger with increased carbon dioxide in the atmosphere, but changes in temperature, humidity and nutrient availability seem to have trumped the benefits of increased carbon dioxide," said researchers from the National University of Singapore. 45 percent of the ...
根据第一段第二句话“T he first plants,evol ved more than 500 million years ago, only gre w in water.(最早的植物,逐渐形成于5亿年前, 只生活在水中。 )“可知该题答案为B。 2.【答案】B 【解析】题干:根据第二段划线部分的意思是什 么?二段第二句话"Different species are adapte d to ...
By comparing the genomes of modern plants to those of their wild relatives, biologists have been working out what genetic changes occurred as plants were domesticated. The teams in Brazil and China have now used this knowledge to reintroduce these changes from scratch while maintaining or even enha...
E.The plants were taller than men. Each grain is as big as a peanut. F.The rice plants he had tended for decades at Anjiang and then Changsha, sowing and nurturing them, visiting daily on his motorbike to inspect them, were not quite there yet. 2022/03/30 | 217次组卷 | 3卷引用...