We can't hear clearly. Can you speak as ____ (loudly) as possible.
给下列句子换一种说法。
只听一声巨响,“诺曼底”号的船身一下被“玛丽”号剖开了一个大口子。
西北干旱半干旱地区的荒漠化、黄土高原的水土流失都说明了( )
42+9=____
21+9=____
45+5=____
29+6=____