烯烃、一氧化碳和氢气在催化剂作用下生成醛的反应，称为羰基合成，也叫烯烃的醛化反应

下列句中划线的成语，运用正确的一项是（）

A．人们对随地吐痰、乱扔果皮一类小事，一直持不以为然的态度，这是很不应该的。

B．实习老师的大学生活多姿多彩，但他的人生道路却饱经沧桑。

C．有记者说，本·拉登言辞温和，彬彬有礼，让人难以置信，这就是世界上杀人不眨眼的头号恐怖

分子。

D．他从小喜欢拉二胡，直到老了仍不改其乐，一有闲暇便拉上一段。

随着人们生活质量的不断提高，废电池必须进行集中处理的问题被提到议事日程，其首要原因是（　　）

A．利用电池外壳的金属材料

B．防止电池中汞、镉和铅等重金属离子对土壤和水源造成污染

C．不使电池中渗透的电解液腐蚀其他物品

D．回收其中石墨电极

Dear Cassy,

Thanks for reminding me by e-mail that you want to baby-sit our children. In spite of the (21) that you are only 12 years old, my wife and I would be (22) to consider your application if you can meet a few modest (23) :

1. Submit three letters from (24) who will certify that you have never failed to follow directions perfectly in class and never failed to hand in a homework assignment (25) .

2. Submit a note from two (26) who will certify that you are in perfect health, have never been sick, and never will be sick.

3. Submit a document from your physical education teacher or team (27) that proves that you can do each of the following: Run two miles in (28) than nine minutes, climb a greased rope to a (29) of twenty feet in thirty seconds while balancing a glass of water on your nose, and walk in bare feet over hot coals and broken glass without complaint or (30) .

4. Submit notarized letters from at least two mental health professionals (31) that you have never (32) a jealous, envious, or hostile thought towards any living being or inanimate object.

5. Play and (33) five expert chess players while blindfolded after going without sleep for 48 hours.

6. Wait (34) for two years while we have private investigators (35) that all your documents are authentic.

Your loving and trusting friends,

The Smiths

24（）

A．parents

B．classmates

C．neighbors

D．teachers

从结果看，五代十国分裂割据局面的形成，其根本因素是

A．唐朝藩镇割据局面的继续和扩大

B．南方经济有较大的发展

C．黄河流域战乱不休

D．各方面经济、军事实力进行较量的结果

影响稳定汽油蒸汽压的主要成分是（）。