什么叫化石(fossil)?研究化石的意义是什么?
The reconstruction of _____ species from fossil bones was often undertaken by museum workers.
What two effects does burning fossil fuel have?
Fossil fuels that lie buried underground are limited and,______,will be used up in a few hundred years.埋藏在地下的矿物燃料是有限的,很可能在几百年之后就会被用光。
A) It is the largest of its kind<p>B) It is going to be expanded</p><p>C) It is displaying more fossil specimens</p><p>D) It is staring an online exhibition</p>
Which of the following is the equivalent to fossil fuel?
重写句子:Fossil fuels are non-renewable. We need to find alternative energy sources. (compound sentence)