answer:Let the first card be represented by the variable x, and the second card be represented by the variable y. There are four options for the relationship between the suits of x and y: 1. Same color, same suit: There are two options for the suit of x (hearts or diamonds), and once x's suit is chosen, there is only one option for y's suit. Thus, there are 2 possible pairs of cards in this category. 2. Same color, different suit: There are two options for the suit of x (hearts or diamonds), and once x's suit is chosen, there are two options for y's suit (clubs or spades). Thus, there are 2 x 2 = 4 possible pairs of cards in this category. 3. Different color, same suit: There are two options for the suit of x (hearts or diamonds), and once x's suit is chosen, there is only one option for y's suit (the suit of x, either hearts or diamonds). Thus, there are 2 possible pairs of cards in this category. 4. Different color, different suit: There are two options for the suit of x (hearts or diamonds), and once x's suit is chosen, there are two options for y's suit (the opposite color and one of the two remaining suits). Thus, there are 2 x 2 = 4 possible pairs of cards in this category. Therefore, the total number of pairs of cards in numerical sequence that can have a suit is 2 + 4 + 2 + 4 = 12 + 4 = 16.

answer:荔枝病是一种由荔枝所致的疾病，主要发生在儿童和青少年身上。荔枝病的主要症状包括恶心、呕吐、头痛、昏厥和抽搐等，严重时还可能导致死亡。 据研究，荔枝病与荔枝中含有的高含糖量和高氨基酸含量有关，这些物质会对人体的代谢产生负面影响，引起低血糖、低血压和高血氨症等症状。 为了预防荔枝病，人们应该控制荔枝的食用量，特别是儿童和青少年。同时，还要注意饮食平衡，增加蛋白质、糖类和维生素等营养素的摄入量，以促进身体健康。 总之，荔枝是一种美味的水果，但是它也会对人体产生负面影响，特别是儿童和青少年。我们应该合理食用荔枝，保持饮食平衡，以免引发荔枝病。

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