C．cold and dry

　　D．cold and wet

　　18．Why do scientists think deltas near the lake may hold secrets about past life on Mars?

　　A．Because similar places on Earth have become natural deposits of markers of life.

　　B．Because someone has put secrets about past life on Mars there.

　　C．Because past life has been found in other deltas on Mars.

　　D．Because some people are said to have already seen life marks there.

　　19．Which of the following statements is NOT true according to the passage?

　　A．The Noachan epoch was a wet and warm era.

　　B．The lake might have existed 3.4 billion years.

　　C．The discovery can't fully prove that the Mars once hosted life.

　　D．The lake traces prove that there exists life on Mars now.

　　Ⅲ.阅读表达阅读下面短文并回答问题。 [1] It's good to make a mistake, and here is why. First of all, mistakes are a clear sign that you are trying new things. It's always good to try new things because when you are trying new things you are growing. If you never try anything new, how can you improve? How can you expand? The simple answer is “You can't”. Look around you. Almost everything valuable you see in your world is the result of ________．

　　[2] Another good thing about mistakes is this: when you are making mistakes, you are learning. Consider this: Edison failed 10，000 times before he perfected the light bulb. When asked how it felt to fail that many times, he remarked that he hadn't failed 10，000 times, but rather had learned 10，000 things that didn't work.[3] Finally, when you make a mistake you are much closer to success. Why? Because when all is said and done, you will have tried only a few things before you succeed. Every time you made a mistake, you got rid of one bad thing and stepped closer to success.

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