下列装置或操作能达到实验目的的是（）

“减少污染、净化空气，还我一片蓝天”，已成为太原人民共同的心声。

（1）洁净的空气中含量较多的气体有氧气和                      （填化学式）；

（2）汽车燃料燃烧不充分时，会产生炭粒和有毒的                    （填化学式）气体，污染空气；

（3）汽车使用压缩天然气（CNG）作燃料，会减少对空气的污染。天然气所含主要成分的化学式是

                 。压缩天然气（CNG）加气站必须悬挂，因为                           。

2009年10月1日，是中华人民共和国成立60周年的日子。我国举行了盛大的国庆阅兵，并在阅兵式上展示了一些新型的武器装备。假如你以此新闻材料为背景写一篇时政小论文，应该选用的关键词有[ ]

①国家实力增强寻求战略盟友②综合国力提升增强民族凝聚力③增强国家力量主导世界格局④增强国际影响力促进世界和平

A．①②

B．②③

C．②④

D．③④

中华人民共和国成立于1949年10月1日，建国100周年纪念日是（    ）年10月1日。

管径在3.5英寸以下之圈缝作射线检测，可采用（）

A、双壁技术双壁判读

B、双壁技术单壁判读

C、单壁技术单壁判读

D、a与b均可

Sometimes we have specific problems with our mother; sometimes, life with her can just be hard work. If there are difficulties in your (1) , it’s best to deal with them, (2) remember that any (3) should be done (4) person or by letter. The telephone is not a good (5) because it is too easy (6) either side to (7) the conversation.

Explain to her (8) you find difficult in your relationship and then (9) some new arrangements that you think would establish a (10) balance between you. Sometimes we hold (11) from establishing such boundaries because we are afraid that doing (12) implies we are (13) her. We need to remember that being (14) from our mother does not (15) mean that we no longer love her. If the conflict is (16) and you cannot find a way to (17) it, you might decide to give up your relationship with your mother for a while. Some of my patients had (18) "trial separations". The (19) allowed things to simmer down, enabling (20) .

（14）（）

A.harmonious

B.wholesome

C.malignant

D.independent