近期统计数据显示，癌症已成为我国城乡居民的首要死因．请根据提供的资料回答问题：

体外分别培养某种癌细胞和正常体细胞，图中代表癌细胞生长曲线的是____ ．在体内，癌细胞可能侵袭周围正常组织，说明癌细胞具有____ 的特性．

（多选）下列是对细胞、组织有关知识的叙述，你认为不正确的一项是（  ）

棱长为1的正方体ABCD﹣A₁B₁C₁D₁中，点M，N分别在线段AB₁，BC₁上，且AM=BN，给出以下结论：其中正确的结论的个数为（　　）

①AA₁⊥MN      

②异面直线AB₁，BC₁所成的角为60°

③四面体B₁﹣D₁CA的体积为$\frac{1}{3}$

④A₁C⊥AB₁，A₁C⊥BC₁．

    An officer（军官）is at a bus stop. He wants to see his girlfriend by bus. He wants to tell his girlfriend the time of his bus, and then she can meet him at the stop in her car. He wants to call his girlfriend on a pay phone（付费电话）,but he doesn't have a coin（硬币）for the phone. He wants someone to help him.

    A soldier（士兵）is near the stop. The officer walks to the soldier and asks,“Do you have any coins for the phone?”

    “Let me have a look,” says the soldier. “I'll see if I can help you.”

    “Don't you know how to speak to an officer?” says the officer. “Now let's say it. Do you have any coins for the phone?”

    “No, sir,” says the soldier.

不等式2x﹣6＞0的解集在数轴上表示正确的是（　　）