Mike: Dad, winter just started here in Hangzhou, but it's summer in Auckland. Why do different parts of the world have different seasons?
Dad: (1)
d
Our earth is divided into the northern half and the southern half. (2)
b
Mike: But why?
Dad: It's because of how the earth moves. (3)
a
It turns around an imaginary pole in its centre.
Mike: I know that much.
Dad: But did you know that this imaginary pole isn't straight up and down? (4)
f
Right now, the southern half of the planet is leaning towards the sun. (5)
e
That's why it's summer there. Up here, the northern half is leaning away from the sun. We don't get as much direct sunlight, so it's colder here.
Mike: Yes, that's true. It's snowy too! So … when the northern half starts leaning towards the sun, we will have summer?
Dad: Exactly!
Mike: (6)
c
Thanks for explaining this to me, Dad.
Dad: No problem, Mike.
答案：【解析】：
这是一道英语语法和句子结构填空的题目，同时要求写出句子主干结构。题目给出了一个对话，对话中父亲向Mike解释了为什么世界上不同地方有不同的季节。对话中有6个空白处需要填写，同时需要分析所填句子的主要结构。
1. 对于第一个空白处，需要填入一个引导解释或回答问题的句子。选项d "That's a great question." 是一个常用的回答，表示对问题的赞赏，并引出接下来的解释。
2. 第二个空白处需要描述地球被分为两半的情况。选项b "Both halves always have different seasons." 直接说明了地球两半的不同季节，与Mike的问题相呼应。
3. 第三个空白处需要描述地球的运动方式。选项a "The earth turns once every day." 准确地描述了地球每天自转一次的事实。
4. 第四个空白处需要解释地球自转轴倾斜的原因。选项f "It leans a little." 直接说明了地球自转轴是倾斜的。
5. 第五个空白处需要描述地球南半球倾向太阳时的季节情况。选项e "It gets more direct sunlight." 解释了为什么南半球是夏天，因为它得到了更多的直射阳光。
6. 第六个空白处是Mike对父亲解释的回应。选项c "Our planet is so interesting." 表达了Mike对地球现象的兴趣和好奇。
主干结构分析：
1. "That's a great question." 主干为 "That's a question."
2. "Both halves always have different seasons." 主干为 "Both halves have seasons."
3. "The earth turns once every day." 主干为 "The earth turns."
4. "It leans a little." 主干为 "It leans."
5. "It gets more direct sunlight." 主干为 "It gets sunlight."
6. "Our planet is so interesting." 主干为 "Our planet is interesting."
【答案】：
1. d That's a great question. (主干: That's a question.)
2. b Both halves always have different seasons. (主干: Both halves have seasons.)
3. a The earth turns once every day. (主干: The earth turns.)
4. f It leans a little. (主干: It leans.)
5. e It gets more direct sunlight. (主干: It gets sunlight.)
6. c Our planet is so interesting. (主干: Our planet is interesting.)
B When you think about the different seasons, what sounds come to mind? Write an essay about the sounds of the seasons.The Sounds of Seasons
Each season has its special charm, and for me, the sounds of each season are like beautiful music that I never get tired of listening to.
Spring brings the sound of life waking up. I love the sound of raindrops tapping on the window, like a gentle drumbeat. Birds start singing happily in the trees, and sometimes I can hear the bees buzzing around the flowers in my garden. It makes me feel that everything is full of hope.
Summer is a lively season with exciting sounds. In the afternoon, the cicadas sing loudly in the trees, which is the most special sound of summer. At night, I often hear the frogs croaking by the pond near my home, and crickets chirping in the grass. It's like a big outdoor concert.
Autumn has some soft and nice sounds. The wind blows through the trees, and I can hear the leaves rustling and falling to the ground, making a "shush" sound. Sometimes, geese fly south in a V-shape, honking loudly as if they are saying goodbye to us.
Winter is a quiet season but has lovely sounds too. When it snows, everything is silent, but I enjoy the sound of walking on the snow, which is "crunch, crunch". At home, the sound of the fire crackling in the fireplace and people laughing while drinking hot chocolate makes me feel warm and happy.
I really love all the sounds of the seasons. They make my life more colorful and interesting, and I always look forward to hearing them every year.
答案：The Sounds of Seasons
Each season has its special charm, and for me, the sounds of each season are like beautiful music that I never get tired of listening to.
Spring brings the sound of life waking up. I love the sound of raindrops tapping on the window, like a gentle drumbeat. Birds start singing happily in the trees, and sometimes I can hear the bees buzzing around the flowers in my garden. It makes me feel that everything is full of hope.
Summer is a lively season with exciting sounds. In the afternoon, the cicadas sing loudly in the trees, which is the most special sound of summer. At night, I often hear the frogs croaking by the pond near my home, and crickets chirping in the grass. It's like a big outdoor concert.
Autumn has some soft and nice sounds. The wind blows through the trees, and I can hear the leaves rustling and falling to the ground, making a "shush" sound. Sometimes, geese fly south in a V-shape, honking loudly as if they are saying goodbye to us.
Winter is a quiet season but has lovely sounds too. When it snows, everything is silent, but I enjoy the sound of walking on the snow, which is "crunch, crunch". At home, the sound of the fire crackling in the fireplace and people laughing while drinking hot chocolate makes me feel warm and happy.
I really love all the sounds of the seasons. They make my life more colorful and interesting, and I always look forward to hearing them every year.
