读图，完成下列问题：

铁是合成人体血红蛋白不可缺少的成分，人体缺铁可引起贫血症．食物中的铁一般是有机铁，人体只能吸收利用其中的10%左右，铁锅中却含有容易被人体吸收利用的无机铁，用铁锅烧菜，对防治缺铁性贫血症大有好处．钙在人体内的总量达1 300g，其中99%存在于骨骼中，一旦离子态的钙在血浆中的浓度明显下降，神经肌肉兴奋性会大大增加，出现手足抽搐症．相反，血钙过高会引起心脏、呼吸衰竭．

（1）贫血症患者血液中运输____ 的能力低．

（2）人体中含钙最多的是____ ．

A．肌肉    B．骨骼     C．上皮组织    D．神经组织

（3）人在长跑后，因流汗过多常出现抽搐现象，这是因为身体中____ 含量太低．

A．K⁺   B．Na⁺C．Ca²⁺   D．Mg²⁺

（4）水在细胞中主要以____ 的形式存在，无机盐在细胞中主要以____ 的形式存在．

在一根长导线下面平行放置一个可以在水平面自由转动的小磁针，导线通电时，小磁针发生转动，这就是著名的 ____实验，它证明了电流周围存在 ____

阅读理解

    Being outgoing is good for your life. Those who are more outgoing may have more fun in life. In fact, being outgoing is not so hard as you think. Even shy people can be outgoing.

    You can start becoming outgoing with your best friends or a group of friends. But the real challenge（挑战）comes when you meet strange people. Smile more, and usually they will return your smile. In this way, you may have some more talks.

    Start a talk. Just a simple "Hello" or "How is it going” is a good start. If you want to make interesting talks, you should read news in the newspapers and prepare（准备）your views, or surf the Internet for new information and then keep that in mind.

    The easier way to become more outgoing is to go out. This is also the most important step. Go to a park, the beach, a club, a party or any other places that you think can be fun, and you may make new friends there.