题目内容

1. By the year 2050, most children (teach) online, so they can learn at home.2. These clothes (make) from environmentally friendly materials.3. Last week, my house (flood) because of the heavy rain.4. Please take your litter home. It (should not, throw) on the ground.5. Every day, all over the world, animal habitats __ (be, lose).

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Last summer, my friends and I organized a (1) _______ (required/support/fund-raising) event to raise money for my local animal shelter. We knew that the shelter needed some (2) _ (support/possess/valid) and we really wanted to make a difference. We booked our (3) _ (community/shelter/marine) hall and my friend, who is a really good baker, made some delicious cakes. Another friend made tea and coffee, and a local artist agreed to sell some of his (4) _ (badges/causes/handicrafts) to raise some extra money. The event was a great success. Over 100 people came along and many of them made some very generous (5) _________ (causes/support/donations). It felt so good to give something back to our community and to help a cause which we felt strongly about.

Imagine your friend has recently had her home destroyed by a forest fire. She is currently living in a homeless shelter, with hundreds of other people from her town. Follow the prompts below to write a letter of consolation.Dear Elena,I was so sorry to hear about __________. There have been a lot of news reports about the fire on the TV news and I can see that . I hope that .I just wanted to write and check that . I am really sorry to think about . Please let me know if .My college is . I hope that this .With _,Martha

安装飞轮不能达到调节机械非周期性速度波动目的的原因是

A. 飞轮的作用只是“吸收”能量
B. 飞轮的作用只是“释放”能量
C. 它既不能创造出能量，也不能消耗能量
D. 飞轮的作用只是“吸收”和“释放”能量

飞轮应优先安装在机器系统的高速/低速）轴上。