给患者注射胰岛素、葡萄糖后，不适于作血清钾测定，因为此时钾代谢的变化是（）。 A.无

根据下面短文内容，在短文的空格处填上一个恰当的词，使短文完整、通顺。

Now students’ English handwriting（书法）gets worse and worse. That makes their teachers feel worried. Is your English handwriting beautiful? If   小题1:  , here are four steps that really work!

u Use paper with lines

Using paper with lines can keep you writing straight    小题2:  of up or down when you write English words or sentences. Those lines on the paper can help you to write words in the right size. Be sure to    小题3: the lined space completely. And make sure those capital letters(大写字母) are written properly.

u Slow down

If your writing is hard to read, try slowing down a little. For some kids, going slower makes the handwriting clear. If you write too   小题4:, it’s hard for you to stop where you should, and even worse, you may make more   小题5: .

u Hold your pencil right

When you hold your pencil the correct way, writing is much   小题6:  . Some kids press down really hard when they write. That makes the handwriting not nice. Try to be relaxed and don’t hold the pencil so hard. Let your writing appear nice and clean. If you do so, people will guess you are a student    小题7:  a good habit.

u     Draw more pictures

Drawing can improve your handwriting. You need to use the skills to control(控制) your pencil better    小题8:  you are drawing pictures. Even though you have no chance to draw at school, you can practice by   小题9:  at home.

Handwriting is very important. Imagine you are a world-famous movie star or a well-known sports player, what do you do when your   小题10:  run up to you? Give them your autographs(亲笔签名), of course!  

乙炔（化学式C₂H₂）俗称电石气，实验室中常用电石（一种灰色块状固体，化学式CaC₂）与水在常温下反应制取，该反应中同时还有氢氧化钙[Ca（OH）₂]生成．通常情况下，乙炔是一种无色、无味、难溶于水的气体，标准状况下，乙炔的密度是1.16g/L（空气的密度为1.293g/L）．乙炔在氧气中燃烧放出大量的热，火焰温度高达3000℃以上，可用来焊接或切割金属，在一定的条件下，乙炔还可以与氯化氢气体反应生成氯乙烯等．根据上述提供的信息，请你回答下列问题：

（1）指出下图中标号仪器的名称①______②______③______

（2）写出实验室制取乙炔的化学反应方程式______．

（3）上述信息中描述了有关乙炔的______种物理性质．

（4）在实验室中制取乙炔气体时，可采用上图中的发生装置为（填序号，下同）______，收集装置为______．

（5）实验室制取乙炔时，首先要进行的一步操作是______．

（6）乙炔在氧气中燃烧的化学方程式是______，根据你学到的知识，你认为在点燃乙炔气体前最需要注意的问题是______．

根据《税收征收管理法》的规定，税务行政机关可以采取税收保全措施。税收保全措施适用于以下( )。

A．从事生产经营的纳税人

B．非从事生产经营的纳税人

C．扣缴义务人和纳税担保人

D．所有应履行纳税义务的纳税人

为了调查当前人们的识字水平，其实验者列举了20个词语，请30位文化人士识读，这些人的文化程度都在大专以上。识读结果显示，多数人只读对3到5个词语，极少数人读对15个以上，甚至有人全部读错。其中，“蹒跚”的辨识率最高，30人中有19人读对；“呱呱坠地”所有人都读错。20个词语的整体误读率接近80%。该实验者由此得出，当前人们的识字水平并没有提高，甚至有所下降。
以下哪项如果为真，最能对该实验者的结论构成质疑( )

A．实验者选取的20个词语不具有代表性
B．实验者选取的30位识读者均没有博士学位
C．实验者选取的20个词语在网络流行语言中不常用
D．“呱呱坠地”这个词的读音有些大学老师也经常读错

用于先天性甲减的筛选的是（ ）

A．T3、T4

B．TSH

C．

D．

E．TG