Unit 7 课时2 Reading and critical thinking（同步课件）-【上好课】2024-2025学年七年级英语上册同步精品课堂（沪外教版2024）

Reading and critical thinking Global warming Unit Global warming The world is getting warmer and warmer. Have you ever thought about the effect of global warming on animals? Let’s read a blog article about what has happened to the polar bears in the Arctic. Reading Polar bears in a warming world We use fuel for energy, but it is making the climate warmer. As a result, the ice melts, and the sea level rises. It is bad news for polar bears! Polar bears live in the cold Arctic. The frozen Arctic is their home and the ice is their hunting ground. A polar bear usually stands on the sea ice to hunt for seals when they come up for air. But the ice has started to melt earlier each year. As the ice melts, some polar bears have lost their homes. Homeless polar bears have to move from ice to land earlier and stay on land longer. They become very hungry because they can’t find enough food. Reading Polar bears in a warming world These changes are a result of global warming. Global warming is making life difficult for polar bears. Their future is in our hands. We mustn’t let them down. Let’s save polar bears! Reading Polar bears in a warming world Reading Polar bears in a warming world 1 What is the main idea of the article? a Global warming is making our life difficult. b Using too much fuel can cause global warming. c Polar bears are in danger because of global warming. 2 Why do you think the writer wrote this blog article? a To describe the climate of the Arctic. b To explain what global warming is. c To call for help to protect polar bears. Choose Choose the best answer. I am a polar bear. I live in the 1_________ with my family and friends. We 2____________ the ice to hunt for food. Global warming is 3____________ for us. Our world is getting warmer. As the ice melts, we have lost our 4________ . We have to stay on land 5____________ . There is not 6______________ for us, so we are always hungry. Please help us! Read and fill in the blanks Complete a polar bear’s message. Arctic stand on dangerous homes longer enough food A cause is why something happens, and an effect is what happens. We can look for words such as because, as, as a result, and so to understand the cause and effect relationship. Subskill Understanding cause and effect. Understanding cause and effect is an important part of problem-solving. It involves recognizing the relationship between two events or conditions and determining how one affects the other. To understand cause and effect, you need to observe and analyze the situation carefully, consider all possible factors, and make logical deductions. This process can help you identify solutions to problems and make informed decisions. Subskill Understanding cause and effect. a Some polar bears have lost their homes. b Ice melts earlier each year. c It is making the climate warmer. d The sea level rises. Cause and effect Choose the sentences from the text to complete the cause-and-effect chain. c It is making the climate warmer. b Ice melts earlier each year. d The sea level rises. a Some polar bears have lost their homes. Remember Put the pictures in the correct order according to the blog article on page 114. 1 2 3 4 5 Understand Here are more details about the effects of global warming on polar bears. Read the sentences and fill them in the table below. Understand Read the sentences and fill them in the table below. They need to swim much longer, sometimes up to 30 miles, to find seals. One bear lost close to 20 kilogrammes in just ten days. By 2050, two thirds of polar bears will disappear. A study shows that polar bears are losing their homes faster. “The effect on the bears is greater than we thought,” a polar bear scientist says. Global warming has a profound and specific impact on polar bears. Here are some relevant data and facts to more comprehensively understand this impact. Apply Choose one sentence and add it to the blog article. It can give readers one more strong reason to protect polar bears. 1. Sea Ice Decline Rate: Since 1979, the extent of sea ice in the Arctic has decreased by an average of about 13.1% per decade, with an even more significant reduction in sea ice volume. Apply Choose one sentence and add it to the blog article. It can give readers one more strong reason to protect polar bears. 2. Difficulty in Obtaining Food: Polar bears rely on sea ice to catch seals, their primary food source. As sea ice decreases, polar bears need to swim longer distances to find food, sometimes over hundreds of kilometers. Apply Choose one sentence and add it to the blog article. It can give readers one more strong reason to protect polar bears. 3. Increased Energy Consumption: In ice-free waters, the movement speed of polar bears is about 40% slower than on ice, causing them to consume more energy to look for food. Apply Choose one sentence and add it to the blog article. It can give readers one more strong reason to protect polar bears. 4. Decreased Survival Rates: Studies have shown that if the ice-free period in summer exceeds 180 days, the survival rate of polar bears will greatly decrease. Apply Choose one sentence and add it to the blog article. It can give readers one more strong reason to protect polar bears. 5. Reproductive Issues: The disappearance of sea ice also affects the reproductive cycle of polar bears. Pregnant female bears need sufficient sea ice to find and capture food to support their survival and that of their cubs. Apply Choose one sentence and add it to the blog article. It can give readers one more strong reason to protect polar bears. 6. Population Decline: According to the International Union for Conservation of Nature (IUCN), the number of polar bears has significantly declined over the past few decades. The population of polar bears in some areas has already decreased by about 30%. Apply Choose one sentence and add it to the blog article. It can give readers one more strong reason to protect polar bears. 7. Future Predictions: If greenhouse gas emissions continue to increase, ice-free summers may occur in the Arctic by the end of this century, posing even more severe survival challenges for polar bears. Apply Choose one sentence and add it to the blog article. It can give readers one more strong reason to protect polar bears. Suffix:-less The suffix -less, meaning “without”, is added to nouns to create adjectives. e.g. hopeless means “having no hope”. helpless, careless, useless, and jobless. Homework Look for some other information or data about the bad effect of global warming on animals. Draw your own mind map of the cause-and-effect chain. Collect some more data and statistics to support your ideas on the global warming. $$