43. I want to know how long dinosaurs existed on the earth.(existence) 相关知识点: 试题来源: 解析 existed 题目要求填入一个描述恐龙在地球上存在状态的动词。根据提示词“existence”,我们需要使用“exist”的过去式来表示恐龙在地球上存在的时间跨度。因此,答案为“existed”。
Big cats are at the top of the food chain and have few predators of their own. Big cats include snow leopards, clouded leopards, tigers and lions. Based on genetic judgements, most scientists believe they first existed in Central Asia. But previously, the oldest known big ca...
1【题文】Do you know how long the dinosaurs ___ on the earth before their extinction?A.had existedB.had been existedC.have existedD.have been existed 2Do you know how long the dinosaurs ___ on the earth before their extinction?A.had existedB.had been existedC.have existedD.have be...
In a rectifier network, or group of such networks, fed by a 3-phase power supply, if the pulse number p of the rectified voltage is equal to 3 (or a multiple of 3), the primary currents have kp±1-rank harmonics only, k being an integer. In this paper, a general demonstration...
How long will it take to get there? M:It should take about 20 minutes, depending on the traffic. W:Oh,okay.I have a flight to catch in an hour,so I'm hoping to make it on time. M:No problem, We'l...
Instead of a long loop of DNA like a bacterium, cells of plants and animals have chromosomes that hold the DNA strands. Humans have 23 pairs of chromosomes, for a total of 46 chromosomes. Fruit flies have five pairs. Dogs have 39 pairs, and some plants have as many as 100. Chromosomes...
根据文章第一段Hardly a day goes by without a company telling us in its beautifully crafted advertising how much it contributes to the environment on our behalf.Flowers grow out of power-station chimneys;SUVs are presented in natural habitats;oil companies use sunny,friendly lo...
These four renderings have a common thread: they each emphasize that Jesus is eternal. He has always existed and he will always exist, because he is, and always has been, eternally self-existent. Because he is God, he has no beginning and no end. Because we are finite creatures with pea...
For example, we now know that the earth is not flat, as was once believed by many Christians. On the other hand, the big bang theory is only a theory and not a fact. Questions About God's Existence How do we know if God is real? Scientists have never tried to prove God exists ...
How fast are African wild dogs? How smart were dinosaurs? Could dinosaurs swim? How long did ornithischian dinosaurs live? How long were dinosaurs the dominant species on Earth? How radioactive are dinosaur bones? How did dinosaurs fly? How many species of dinosaurs were there? What was the...