大家好！

又到了7PLUS真题讲解的时间了

今天我们拿一个近期高频的SWT题目，带着大家分析一下这篇高频题目应该怎样写。

同时，通过同学们的答案，看一下大家在解答SWT时，内容上需要注意什么问题。

让我们一起看看这篇SWT的原文，同学们可以试着先写出自己的答案，然后再和本页下方的视频，对比一下自己的答案，看看自己是否也出现和视频中这位同学出现的问题。

Mexico City, a miner in the state of Chiapas found a tiny tree frog that has been preserved in amber for 25 million years, a researcher said. If authenticated, the preserved frog would be the first of its kind found in Mexico, according to David Grimaldi, a biologist and curator at the American Museum of Natural History, who was not involved in the find.

The chunk of amber containing the frog, less than half an inch long, was uncovered by a miner in Mexico southern Chiapas state in 2005 and was bought by a private collector, who loaned it to scientists for study. A few other preserved frogs have been found in chunks of amber, a stone formed by ancient tree sap, mostly in the Dominican Republic. Like those, the frog found in Chiapas appears to be of the genus Craugastor, whose descendants still inhabit the region, said biologist Gerardo Carbot of the Chiapas Natural History and Ecology Institute. Carbot announced the discovery this week.

The scientist said the frog lived about 25 million years ago, based on the geological strata where the amber was found. Carbot would like to extract a sample from the frogs remains in hopes of finding DNA that could identify the particular species, but doubts the owner would let him drill into the stone.

下面，我们看一下关于这篇SWT的解析以及以为对于一位学生答案的评改