封开县境内新发现了大型的“钼矿”，金属钼可用于制造火箭、导弹等耐高温温材料。若钼铅矿(PbMoO₄)中的铅元素为＋2价，则钼元素的化合价为    (    )

增加：在缺词处加一个漏字符号(∧),并在其下面写出该加的词。

删除：把多余的词用斜线( \ )划掉。

修改：在错的词下划一横线,并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

2）只允许修改10处,多者(从第11处起)不计分。

    I am writing to ask for whether you are able to do me a favor. I want to have a pen pal, hopefully a girl in the early twenties, and with interests similarly to mine. In my mind, he is someone interesting in traveling, swimming, and playing table tennis. Beside, it will be better for her to have a pet dog as I have been keeping one at home for some time. With such pen pal, I hope I can share with her my experiences in traveling, taking care of pets, or whichever we have in common. I believed I will improve my English by doing so and learning more about her country. I am looking forward to hearing from you soon.

党的十八届中央纪委七次全会强调，管党治党不仅关系党的前途命运，而且关系国家和民族的前途命运，必须以更大的决心、更大的气力、更大的勇气抓紧抓好。这体现了***（    ）

①遵守党纪国法，扩大党的执政根基

②坚持从严治党，保持先进性和纯洁性

③加强作风建设，巩固党的执政地位

④健全民主集中制，大力发展党内民主