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Directions: Write an essay about the relationships between human activities and their impacts on earth. People are building all kinds of constructions on earth, using any kind of resources found on earth, but one day the resources will be run out. What’s you comment on this Follow the outline:1.Human activities have effects on the planet.2. Give examples.3. Make a summary of your points.

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甲收藏名画一幅，并为其保险。现甲将此画转让于乙。双方约定，乙当日付一半价款，名画所有权转移于乙，另一半价款3日内付清，价款付清交付名画。乙当日给付一半价款，一周后，乙仍未清偿欠款，甲家因雷击失火，名画毁损。甲向乙索要欠款，乙要求甲退还已付价款。问：（1）此画风险由谁承担说明理由。（2）谁可以向保险公司索赔说明理由。（3）谁的主张可以成立说明理由。

Petroleum is a very important mineral. It gives us heat and light. It also gives us power for our cars, planes, and ships. It gives us power for machines of all kinds.How was petroleum created Scientists believe petroleum was formed from the remains of plants and animals. These plants and animals lived and died millions of years ago. Remains are what is left after a plant or animal has died.What exactly is petroleum Petroleum is a mineral that is a mixture of hydrocarbons. It is an oily liquid which may be brown, green, or black in color. The word "petroleum" comes from Latin and Greek. It means "rock oil".Crude oil is petroleum that comes directly from deep in the ground. It is then taken to a refinery. A refinery is a kind of factory with equipment in it to refine oil. At a refinery the crude oil is purified and separated into its various parts. From the refined petroleum we obtain important products, such as gasoline, kerosene, fertilizers, detergents, plastics, drugs, and perfumes. These are just a few of the thousands of useful products we get from this valuable mineral - petroleum. From the refined oil we obtain important products, such as(), kerosene, detergents, (), and perfumes.

Petroleum is a very important mineral. It gives us heat and light. It also gives us power for our cars, planes, and ships. It gives us power for machines of all kinds.How was petroleum created Scientists believe petroleum was formed from the remains of plants and animals. These plants and animals lived and died millions of years ago. Remains are what is left after a plant or animal has died.What exactly is petroleum Petroleum is a mineral that is a mixture of hydrocarbons. It is an oily liquid which may be brown, green, or black in color. The word "petroleum" comes from Latin and Greek. It means "rock oil".Crude oil is petroleum that comes directly from deep in the ground. It is then taken to a refinery. A refinery is a kind of factory with equipment in it to refine oil. At a refinery the crude oil is purified and separated into its various parts. From the refined petroleum we obtain important products, such as gasoline, kerosene, fertilizers, detergents, plastics, drugs, and perfumes. These are just a few of the thousands of useful products we get from this valuable mineral - petroleum. It is an()which may be brown, green or black in color.

Miss Green was very fat. She went to see the doctor.The doctor said, "You need a diet, Miss Green, and I have got a good one here." He gave her a small book and said, "read this carefully and eat the things listed on page 11 every day. Then come back and see me in two weeks’ time."Miss Green came again two weeks later, but she wash’ t thinner; she was fatter. The doctor was surprised and said, "Are you eating the things listed on page 11 of the small book.’""Yes, doctor." she answered.The next day the doctor visited Miss Green during her dinner. She was very surprised to see him."Miss Green," he said, "Why are you eating potatoes and bread They are not in your diet.""But, doctor," Miss Green answered," I ate my diet at lunch time. This is my dinner.\ What did the doctor do then