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单选题
Why does the speaker ask us to consider “turning off a light switch”?
A
To show that the climate system is sensitive to light.
B
To illustrate the sudden move from one climate state to another.
C
To demonstrate how to operate the light switch.
D
To explain how the operating mode works under increasing pressure.
参考答案
参考解析
解析：
录音中明确提到“To help understand this sudden move from one state to another, consider turning off a light switch.”，所以说话者让我们考虑“关灯”是为了帮助我们理解从一种状态到另一种状态的突然转变，所以选B。
【录音原文】
All life on earth ultimately depends on the oceans, which cover 71 percent of the planet. These vast basins of water provide most of the oxygen in our atmosphere, and microscopic plants absorb millions of tons of carbon dioxide each day. This watery region is also home to the coral reefs. Coral reefs are extremely important for biodiversity, it provides habitats to over 25% of all marine life. However, coral bleaching is threatening many of the world’s coral reefs which could be killed within our lifetime. The seas also hold a precious food resource, providing 80 million metric tons of food a year through fishing. People recognize that climate-related variations are playing an important role in deciding the productivity of several fisheries.
Waters are freshening from increased Arctic runoff and rainfall, from melt of Antarctic ice shelves and reduced sea-ice formation. This will slow the thermohaline circulations of the North Atlantic and Southern Oceans and reduce the circulation of deep waters. The thermohaline circulation is sometimes called the global conveyor belt. Unlike the atmosphere, which is characterized by turbulent weather systems, the deep waters are fairly stable. This is because it is heated from above, in contrast to the atmosphere, which is heated from below. However, the Earth’s climate system has sensitive thresholds and pushed past a threshold, the system can jump quickly from one stable operating mode to a completely different one. To help understand this sudden move from one state to another, consider turning off a light switch. The slowly increasing pressure of a finger pushes on the switch until it flips over and immediately plunges the room into darkness.
录音中明确提到“To help understand this sudden move from one state to another, consider turning off a light switch.”，所以说话者让我们考虑“关灯”是为了帮助我们理解从一种状态到另一种状态的突然转变，所以选B。
【录音原文】
All life on earth ultimately depends on the oceans, which cover 71 percent of the planet. These vast basins of water provide most of the oxygen in our atmosphere, and microscopic plants absorb millions of tons of carbon dioxide each day. This watery region is also home to the coral reefs. Coral reefs are extremely important for biodiversity, it provides habitats to over 25% of all marine life. However, coral bleaching is threatening many of the world’s coral reefs which could be killed within our lifetime. The seas also hold a precious food resource, providing 80 million metric tons of food a year through fishing. People recognize that climate-related variations are playing an important role in deciding the productivity of several fisheries.
Waters are freshening from increased Arctic runoff and rainfall, from melt of Antarctic ice shelves and reduced sea-ice formation. This will slow the thermohaline circulations of the North Atlantic and Southern Oceans and reduce the circulation of deep waters. The thermohaline circulation is sometimes called the global conveyor belt. Unlike the atmosphere, which is characterized by turbulent weather systems, the deep waters are fairly stable. This is because it is heated from above, in contrast to the atmosphere, which is heated from below. However, the Earth’s climate system has sensitive thresholds and pushed past a threshold, the system can jump quickly from one stable operating mode to a completely different one. To help understand this sudden move from one state to another, consider turning off a light switch. The slowly increasing pressure of a finger pushes on the switch until it flips over and immediately plunges the room into darkness.
更多 “单选题Why does the speaker ask us to consider “turning off a light switch”?A To show that the climate system is sensitive to light.B To illustrate the sudden move from one climate state to another.C To demonstrate how to operate the light switch.D To explain how the operating mode works under increasing pressure.” 相关考题
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共用题干
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初中英语?语法
一、考题回顾
二、考题解析
【教案】
Teaching aims:
Knowledge aim:
Students will know the usage of the frequency adverbs and the sentence structure “How often...?”.
Ability aim:
Students can use the sentence structure freely in their daily life.
Emotional aim:
Students will be more confident in learning English and not afraid of speaking English.
Key and difficult point:
Key Point: Students will know how to use the sentence structure in their daily life.
Difficult Point: Students can cultivate their confidence in learning English.
Teaching procedure:
Step 1: Warming-up
1. Greetings.
2. Ask students what they usually do in their spare time and why, and ask some of them to share with the whole class.
Step 2: Presentation
1. Listen to the tape for the first time and find out what the speaker does every day, and then invite students share their answers.
2. Ask students the following questions: how often does the speaker watch TV? How often does the speaker listen to music? And then write down the sentence on the blackboard.
3. Explain the sentence structure to students: the sentence structure is used to ask questions about how many times something has been done or how many times a state exists in a given period of time.
4. The teacher read the dialogue and ask students to read after it to get a deep understanding.
Step 3: Practice
1. Role-play. Ask students work in pairs and role play the dialogue. Then invite two groups to show in front of the class.
2. Play a game: word cards. Invite two couples of students. Ask one student to choose the card in the box and then ask the other students the question “ how often do you...?” using the activities showed in the card, and then change their role.
Step4: Production
Let students work in groups of 4 and discuss on the topic: how often do you...? according to their own hobbies. After that invite two groups to present in the whole class.
Step5: Summary and Homework
Summary: ask a student to conclude the content of the lesson and summarize with the whole class.
Homework: ask students to ask their friends “ how often do you...?” after class and write down on the exercise book.
Blackboard design:
1. Can you tell me the difference between “How often...?” and “How long...?”?
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