题目内容

Listen to the poem and fill in the blanks with the missing words.[音频]When we try new things,there is always the risk that we will not be ______,we might try a food we have never tried before and _______ it.It could be too _____or too ______ .It could be too ______.We might try a new sport like snowboarding and end up_______a lot.We might try a new style of music and get a _______.We might check out a different kind of art and be totally______.We might try to speak or write a different language and end up ______ourselves.Who wants that? Sounds _____ to me.But if we take the risk, we might try a new food and end up loving it.It could be sweet or have a great ______It could be an experience that makes our taste buds feel like they are ______.We might try a new sport and _______ but we _______ and eventually experienceexhilaration, even for a minute.We might see why people love that sport so much.We might try a new kind of music and regret that we didn’t _____ it sooner.We might see a new kind of art and be _______.We might try to write or speak a different language,and we might be a little ________ as first;but we don’t let it bother us too much because we know that the only way to improve is to makemistakes and keep on _______.I say: Try a new food.Try a new activity. Try to listen to some new music.Walk into a ______, just on a whim, and look around.Try writing and speaking that other language more.Try making some new friends.There are some risks ________, but I know there are rewards too.

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Listen to the passage and decide whether the statements are true (T) or false (F).[音频]1) The speaker suggests that we do spring cleaning because spring is the only season suitable for tidying up rooms.2) It is hard for some people to do spring cleaning since they are sentimental about letting go of their personal property.3) The speaker is anti stuff and suggests that people should not buy new things.4) According to the speaker, brand-name objects can’t make others admire you though they can make you happy.5) What the speaker cannot give up is her CD collection and childhood teddy bear.

工频逆变器的频率范围是_______Hz。

A. 20~30
B. 30~40
C. 50~60
D. 40~50

含有大量的高次谐波的输出波形是______。

A. 方波
B. 阶梯波
C. 正弦波
D. 园波

逆变器的输出电压的波形为_______时,失真度低。

A. 方波
B. 尖波
C. 正弦波
D. 阶梯波

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