the development of the mouseDay 4Tracking the journeys... (P5)Choose the best answer:1. In ancient times, people thought comets were _____.A. warning signs sent by godsB. lucky signs for good behaviorC. great ……

"comets" (彗星). In ancient China, people believed that comets were bad signs. However, scientists say comets may have been important to the beginning of life on the Earth. They have been trying ……

a flying sun. Ancient humans were afraid of the sight of comets (彗星). Many cultures believed that comets.... But today science and technology give us a better understanding of comets.Last week, comet Ison ……

2.3 billionThis is the number of journeys that will be made during Spring Festival in 2009... there will be about 188 million rail journeys, 2 billion road trips and 24 million flights. ……

    建议阅读时间 6分钟With their long, bright tails, comets (彗星) streak (快速移动) across the sky and then disappear. Some even return in the future. It’s no wonder that comets have fascinated ……

conditions, the antelopes go on long journeys to mate (交配) and to give birth to calves (幼崽). ..., the antelopes go on long journeys to mate (交配) and to give birth to calves (幼崽). Hunting, human ……

Scientists believe comets could have brought life to Earth. NASAScientists believe comets could... team of astronomers has a theory: Phosphorus was first brought to Earth by comets (彗星).Using Atacama ……

Scientists believe comets could have brought life to Earth. NASAScientists believe comets could...: Phosphorus was first brought to Earth by comets (彗星).Using Atacama Large Millimeter submillimeter ……

scientists rewriting much of what they thought they knew about comets - the common and often... that took the images.Comets have long been thought of as relatively unvarying surfaces that generate ……

on a multiyear mission to visit at least two comets. A picture taken by telescope last Friday suggests it may ……

A diagram shows how the ADS-B system of tracking planes uses signals sent from GPS satellites and plane transponders to relay information such as a plane’s location, speed and flight number to radio ……

moon, which some astronomers say is expected to wash out the sky with its brightness.Comets... it was repeatedly pelted with comets early in its history.At least four US and European spacecraft ……

) of the Milky Way, satellite tracking, 3D images of the planets of our solar system and their moons... Way, satellite tracking, 3D images of the planets of our solar system and their moons, and so much ……

.  CHINA DAILY航天测控船航天测控船space-tracking ship space-tracking ship China’s space-tracking... missions. Yuanwang 3 represents China’s second generation of space –tracking ships. It undertakes maritime ……

Wang Bin, 20, doesn’t talk much. But get him on the subject of stars and comets, and he’ll never... observe a particular area in the universe and try to spot new small planets or comets. The only problem ……