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The chemical structure of water makes it an excellent medium for life. Water is actually quite simple, but the Way the water molecule is formed gives water its unique properties. The water molecule is made up of two hydrogen atoms and one oxygen atom. They form a polar molecule, that is, one with a slightly positive end and a slightly negative end. Because water is polar, it can break down both solids and gases. |
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| 单选题 |
Alice wanted to go to work in Boston because ________. |
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Of the students asked, _______ students have mottoes. |
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The careless man received a ticket for speeding. He have driven so fast. |
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We can do the job for you quickly, you give us all the necessary information. |
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| 单选题 |
There are about five million species in the oceans and we have yet to learn much about them. Life in the oceans ranges from the tiniest plankton all the way up to giants like sharks and whales. What makes the ocean such a great place to live? The answer is water. |
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How can pests with different colours from plants keep out of danger? |
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What do we know from the passage? |
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__________ with the size of the whole earth, the biggest ocean does not seem big at all. |
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The snakes don’t come out looking for food ____________. |
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personality
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| 单选题 |
Some kinds of birds do not exist on Guam because _________. |
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| 单选题 |
determined
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| 单选题 |
Mrs Black lived ___________. |
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