(转移) to the bike. That makes the bike move. Now imagine riding your bike to create enough power to run a computer. Some students at one school did just that! They jumped on bikes connected to generators (发 电机) and pedaled in place. Soon they were producing electricity. This energy...
18. The poor little boy lay quietly___ the ground, dead. A lot of policemen were sent___ the spot to look___ the murder. 19. Photos have been taken and samples have been collected___ the planets, but no evidence___ life has been discovered___ any of the planets so far. 20. ...
It is impossible to know the answer to ”when was Mars discovered”. It is bright enough to be seen in the night sky without binoculars or a telescope and has been documented for at least 4,000 years. If you were to change the question a little to ”who first theorized that Mars was...
本单元要求学会谈论重要发明的历史及用途,然后针对各项发明的用处及特点,发表自己的看法,并说 重点:讨论重要发明的时间、发明者和用途,学习使用句型“When was the telephone invented?”,“Who was it/were they invented by?”,“What is it/are they used for?”和答语。 明理由。话题一直是围...
When Earth passes through the comet's debris, the "comet crumbs" heat up as they enterEarth's atmosphereand produce impressive "shooting stars" that streak across the sky. 55P/Tempel-Tuttle is a small comet with a nucleus measuring just 2.24 miles (3.6 km) across. It was discovered indepe...
When Geoff Marcy was 14, his parents bought him a telescope.Every night, he would go onto the roof outside his window to see the wonders of the sky.“What excited me most was whether there were planets in other solar systems where life might exist,”he says.“I decided to try to ...
Misophonics had increased activity in the AIC, an area known to play a central role in the system that determines which things we should pay attention to. When the trigger sounds were played, there was not only more activity in this region but also abnormally high levels of connection to...
站在历史维度看，这次选举不过是美国国家政治生活中又一次“例行公事”。站在现实维度看，这次四年一度的权力游戏因“金钱政治”所扮演的重要“戏份”而备受瞩目。2012年，美国总统和国会众参两院选举的支出达到73亿美元。而彭博社预计，2016年的选举支出将达到100亿美元！按照国际货币基金组织公布...
MALE PROFESSOR: OK, we've been discussing the planets in our solar system, and how some of the ones farthest from the Sun were discovered. Well, today I'd like to turn to what are called exoplanets, and how researchers detect them. Maria?FEMALE STUDENT: Exoplanets are planets that orbit...
The Perseid meteor shower is caused by the comet Swift-Tuttle. Swift-Tuttle was discovered independently by two astronomers, Lewis Swift and Horace Tuttle, in 1862. When it last made a pass by Earth in 1992, it was too faint to be seen with the naked eye. The next pass, in 2126, cou...