Mercury has no moons but is a fully-fledged planet like Earth. All the gas planets, including Jupiter and Neptune, have rings of dust. Jupiter's and Neptune's rings are not as big as those of Saturn and Uranus.4A planet does not
根据第1大段“Many people know that rubbish is a big problem on planet Earth. What many people don't know is that junk has become a problem in outer space too.”许多人知道垃圾是地球上的一个大问题。许多人不知道的是,太空垃圾也成为了太空中的一个问题。可知,本文主要讲述的是太空垃圾,环境的...
(5)B 主旨归纳题,文章首段提到Many people know that rubbish is a big problem on planet Earth.What many people don't know is that junk has become a problem in outer space too.外太空垃圾和在地球上的垃圾一样,已经造成了严重的问题,下文也在说明如何产生和销毁这些垃圾,这是和环境相关的,故选B....
It was this mind-blowing series of improbable events that made Earth the possibly unique life-bearing planet it now is. The idea that Earth may indeed be unique could have been spawned by this famous photo taken on the Apollo 8 mission in 1968.正是这一系列令人兴奋的不可能的事件，使地球成...
Peterson, Deb
This first stage produces simple molecules, which can then recombine to make more complex molecules if this astonishing experiment is successful. What we're going to do now is warm the system a little to see what the ice does.第一步产生简单的分子，如果这个惊人的实验成功的话，这些简单的分子就...
Our planet is facing a big problem. It's called environmental pollution. What is it? Let's find out!What is Environmental Pollution?Environmental pollution is that the harmful things are put into the air, water, and soil.These things can make our planet sick and affect the life on it....
一、七选五Many people know that trash is a big problem on planet Earth. What many people don't know is that trash has become a problem in outer space too. 1Statistically, there are more than 22, 000 pieces of junk in space around the earth. And these are just the items that we can...
Incidentally, volcanic islands may seem small, but the island known as the Big Island Hawaii is one of the tallest topographic features on the planet, more than five kilometers from the sea floor to the ocean surface, and almost that much again, up to its highest peak. That's nearly ten...
Jack is washing. Mr R works out his plan for the day. 杰克正在洗衣服。R先生制定了当天的计划。 Jack sits down. Little Robby greets him. Robby takes out the table and brings his breakfast. 杰克坐下。小罗比向他打招呼。罗比拿出桌子,端上早餐。