7×20=____
5×50=____
The extraordinary success of Conan Dole, mainly with his Sherlock Homes, has_________ the market with detective stories.
青铜是人类最早使用的铜、锡合金,下列说法中不正确的是( )
猜谜语。
此物老家在非洲,力大气壮赛过牛,张口大嘴一声吼,吓得百兽都发抖。 (猜一动物)
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