阅读下面短文,掌握其大意,然后从16~25各题所给的 A、B、C和D项中选出最佳选项。Long, long ago when birds were created, they were black in colour.They didn't have any 16 colours on their feathers.One day, when a bird flew close to a tree,
(find) in vinegar,a sour-tasting liquid,evaporate (挥发) quickly,so Boevé and Giot assigned them sounds with higher pitch.Larger molecules were given lower-pitched sounds.In all,the scientists created individual audio descriptions for 20 molecules.Then they combined the sounds of each molecule ...
At a time when natural history was a valuable tool for discovery, Merian discovered facts about plants and Insects that were not previously known. 2018年12月六级真题(第二套)阅读 Section B Because when the dust settles, people are going robe pretty much what they are. 2015年12月六级真题(第...
Related:8 Largest Prehistoric Crocodiles ever roamed Earth The Mammalian Ancestors: Small Yet Resilient Humans owe their existence to the tenacity of small mammals, our distant ancestors. These diminutive, rat-like creatures survived by feeding on insects, worms, and detritus. Not being overly reliant...
Julius Sterling Morton, an avid tree planter and enthusiast, created Arbor Day. The first Arbor Day occurred on April 10, 1872, in Nebraska City, Nebraska. It’s estimated that nearly one million trees were planted on this day. By 1885, Arbor Day had become a legal holiday in Nebraska. ...
根据最后一段中的Boeve said he hoped the process would give other zoologists a new way to compare sawflies' chemical defenses with those from other insects.It may also offer researchers clues about which molecules fight off enemies most?"( Boeve说,他希望这一过程能给 其他动物学家提供-种新的...
答案是 D。文中 “In such conditions, 70 percent fewer insects entered the area. Once they were there, they didn't hang around. Visits to flowers decreased by up to 90 percent.”(在这种情况下,进入该区域的昆虫减少了 70%。一旦进入,它们也不停留。对花朵的访问减少了 90%。)表明在空气污染...
They are small and agile insects that live by feeding on animals like your flurry and harmless cat or dog. Sometimes the pests will carry with them the fleas to the house creating a very big problem to the family. To get rid of these suckers, there is need of special treatment of both...
The finding suggests that like humans, insects also interact with objects as a form of play. Also similar to people, younger bees seem to be more playful than adult bees. “This research provides a strong indication t...
What were the first organisms on the geological time scale? What is the significance of the geological time scale? When was the Permian period? How many eras are in the geological time scale? What is the function of the geological time scale? What are the Middle Age events in the geologica...