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—Where is my baseball, mom? —I t_____ it is in your schoolbag.
1年前
飞机的机翼是上凸下平,当飞行时,机翼上方的空气流速 _________ ,压强小,下方空气流速 _________ 而压强 _________ ,这一压强差,就使飞机获得了向上的升力.
1年前
When I was young, I was always frustrated ( 挫败的 ), and almost everything ended in failure.
1年前
There is some_______under the tree. [ ]
1年前
1年前