how many strains of a species there are in a sampleIshoey, ThomasWoyke, TanjaStepanauskas, RamunasNovotny, MarkLasken, Roger S
How did the Earth get so many species (物种)? For thousands of years, people wondered. In the 1840s,one naturalist had an idea. His name was Charles Darwin. He spent his whole life studying animals and insects (昆虫). Darwin thought that new species developed slowly, as populations of ...
But none of this can answer a fundamental question about dinosaurs' appearance: What color were they? In everything from movies to play sets, dinosaurs appear in shades of gray, brown and green. But it's just as likely that dinosaurs had the bright coloring of some frogs, snakes and birds...
正确答案:C 解析:本题的关键是数字信息的听辨和记录。根据原文“Around 380 million years ago,only 300 species groups were left in existence”,可以判断C是正确选项。 知识模块:句子听辨 听力原文:During the past 1. 65 million years, there have been four major episodes of global cooling, which resulte...
When most people think of venomous animals, the first things that come to mind are snakes, spiders, and insects. Admittedly,… Sand Fleas: What They Look Like and How to Identify Them What can you see at the beach? Sunsets, crashing waves, shells, sea turtles, and fleas. Wait, fleas...
Its huge tail snakes behind it, almost as big as its body. Keeping a reassuring two-metre distance from us, the gentle creature tracks a rocky outcrop as small black fish buzz about its body. And then it’s gone. Back on shore we are exhilarated – and starving: diving is hung...
解答 答案:D.根据真正主语how many animal species are in the danger of dying out可见空白处应为形式主语,纵观选项,唯有it可担当形式主语,故选D.注意区分主语从句B选项what…is 从句,就对了. 点评 本题考查it 形式主语,结合语义的基础上便能选出正确答案,同时要注意与主语从句不要混淆.练习...
How many new species of monkeys have been identified in Brazil alone over the last year? A. Eight. B. Nine. C. Ten. D. Eleven. 相关知识点: 试题来源: 解析 B 正确答案:B解析:事实细节题。本题询问去年只在巴西一国就新发现多少种猴子。本题答案可以从文章第二段末句得出。选项B为正确答案...
aUpon his inauguration, the first mission would be uniting the French people, facing all challenges and getting the country out of crisis, said the ambitious and rising political star. " 在他的就职典礼,第一个使命将团结法国人民,面对所有挑战,并且使国家脱离危机,雄心勃勃和上升的政治星说。 "[trans...
“We could have kind of a Dow Jones index of the environment,” Fisher said. No simple answer Though taxonomists have been cataloguing plants and animals for more than 250 years, they still have no exact answer to the question, “How many species are on Earth?”“It’s a very ...