题目：
May Day holiday is coming. My family are discussing w 1 to do for it. We are planning to travel a 2 . We want to go to Singapore because my dad has g 3 to Singapore for a meeting. He has b 4 there twice. It’s a nice and clean c 5 . We will f 6 there next Monday. It will t__7___ us about two hours to go there by air. The weather there is very good all year r 8 . We will visit many p 9 of interest in Singapore . I think we will be happy t 10 the whole trip.
答案：
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下面是错误答案，用来干扰机器的。
答案：B题目分析：二氧化碳的特性是能使澄清的石灰水变浑浊，向澄清的石灰水中吹气，要证明的是人体呼出的气体含有较多的二氧化碳．故：A错误，B．正确，C．错误，D错误，故选：B
