1年前1个回答
1年前1个回答
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________ (we) teachers are kind and patient. We all love them.
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1年前
We have been friends for nearly twenty years. Nothing can break off our _______.
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I don’t know ______ he will come tomorrow. ______ he comes , I’ll tell you.
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人耳能听到的声波频率范围通常在______之间,蝙蝠靠接收自己发出的______回声,在黑夜中飞行和捕食.监测与控制______波可以用来预报地震、台风.
1年前