5岁男孩，近20天，反复发热、汗多，食欲下降，PPD结果（+++），胸片结果：右肺门

燃料电池是燃料（如CO、H₂、CH₄等）跟O₂（或空气）反应，将化学能转化为电能的装置。对于以强碱为电解质的CH₄燃料电池，下列说法正确的是

A．负极反应式为：O₂+2H₂O+4e=4OH^－

B．负极反应式为：CH₄+10OH^－－8e=CO₃^2-+7H₂O

C．随着放电的进行，溶液的pH不变

D．放电时溶液中的阴离子向正极移动

（）内的冷却水温度最高。

A.机油冷却器

B.气缸套

C.空气中间冷却器

D.高温出水管（摇臂室水套）

我们的日常生活离不开金属。

（1）下图是金属的一个应用实例，请说出利用了金属的什么物理性质？___________________________________________（答出一点即可）。

（2）据有关资料报导，现在世界上每年因腐蚀而报废的金属设备和材料相当于年产量的20%-40%。铁生锈是铁与空气中的水蒸气、____________等发生化学反应的过程。

（3）在探究铁、铜、锌、银的金属活动性顺序时，某小组做了如下三个实验：（所用金属的形状与大小和稀盐酸的用量均相同）

①一段时间后，可观察到实验Ⅱ的现象是________________；反应的化学方程式是______________；

②小组中的甲同学认为：通过实验Ⅰ和Ⅲ可比较出锌和铁的金属活动性强弱。你认为他依据的实验现象是_____________________________。

③乙和丙两位同学认为上述三个实验不能够得出四种金属的活动性顺序，原因是_______________；并在上述实验的基础上，补充了一个实验（下图所示），实现了探究目的。他们的实验：X是金属______，Y是__________溶液（写出化学式）。

______是指细分市场的可获利大小。

A．细分市场的规模

B．细分市场的增长率

C．细分市场的吸引力

D．企业目标及资源

We can make mistakes at any age. Some mistakes we make are about money. But most mistakes are about people. “Did Jerry really care when I broke up(分开) with Helen?” “When I got that great job, did Jim, as a friend, really feel good about it?” “And was Paul friendly just because I had a car?” When we look back, these thoughts can make us feel bad. But when we look back, it is too late.

Why do we go wrong with our friends, or our enemies? Sometimes what people say hides their real meanings. And if we do not really listen, we miss the feeling behind the words. When someone tells you, “You’re a lucky dog!” Is he really on your side? If he says, “You’re a lucky guy!” That is being friendly. But “a lucky dog”? There is a bit of envy (嫉妒) in those words. What he may be saying is that he does not think you deserve (应得) your luck.

“Just think of all the things you have to be thankful for” is another phrase（短语） that says one thing and means another. It could mean that the speaker is trying to get you to see your problem. But this phrase contains the thought that your problem is not at all important.

How can you tell the real meaning behind someone’s words? One way is to take a good look at the person talking. Do his words fit the way he looks? Is what he says shown by the tone of voice?  The look in his eyes? Stop and think. The minute you spend thinking about the real meaning of what people say to you may save your another mistake.

小题1:When the writer thinks of some of the things that happened between him and his friends, he          .

A．feels happy, thinking how nice his friends are to him

B．feels he might not have understood his friend’s true feelings

C．thinks it a mistake to have broken up with his girl friend

D．is sorry that his friends let him down小题2:When the writer talks about the saying, “You’re a lucky dog!”, he is saying that          .

A．the speaker is just friendly

B．this sentence suggests the same as “You’re a lucky guy!”

C．the word “dog” should not be used to apply to（运用到） people.

D．sometimes the words show that the speaker is a bit envious.小题3:This passage tries to tell you how to          .

A．avoid mistakes about money and friends

B．get an idea of friendly people

C．avoid mistakes in understanding what people tell you

D．keep people friendly without trusting them小题4:The writer suggests that           should be trusted.

A．everybody

B．nobody

C．all the people

D．not all the people