甲为我国沿某线所作的地形剖面示意图，读图回答下列问题。L3最接近的地理界线是（） A

某建筑公司雇佣的农民工甲，农民工不享受工伤保险。第一天上班，负责浇筑混凝土的工长乙在没有对其进行任何说明的情况下，安排甲去正在施工的振捣混凝土工作。工作中，由于振捣棒的剧烈振动加之桥上空间狭窄，甲从桥上掉了下来，摔成重伤。

生产经营单位的主要负责人和安全生产管理人员必须具备( )。

A．相关的生产知识和生产能力

B．与本单位所从事的生产经营活动相应的安全生产知识和管理能力

C．本科以上的学历和安全生产知识的能力

D．有主管部门对其安全生产知识和管理能力考核合格后方可任职

遗传变异与物种演化是生物界中存在的普遍现象，这种现象产生的原因是( )。

A．有不同的“父母”的原因

B．基因的重组或突变

C．不同的生物之间的融合

D．现在还没有确切的答案

Letter A

Dear Rose,

I like your programmes very much. I’m now writing to ask you something about American social customs. My American friends want me to join them in their dinner party. I am very happy and have decided to go, but I’m a little worried about it, too. The social customs in my country are very different from here, so I’m afraid of making mistakes.

Should I bring a present, such as sweets or flowers Should I arrive on time or a little late At the dinner table, how can I know which fork or knife to use How can I let the family know that I’m thankful for their kindness

Wang Lin

Letter B

Dear Wang Lin,

It’s a good idea to bring a small present when you go to a dinner party. Flowers are always nice, or you may bring a bottle of wine if you know that your friends drink it.

You should arrive on time or five to ten minutes late. Don’t get there early. If you’re going to be more than fifteen minutes late, you should call and tell them.

Try to be free at the dinner table. If you don’t know about choosing the right fork or knife, just watch the other people, and follow them. If you still have no idea of what to do, ask the person next to you.

If you like the food, say so. Of course, you’ll thank them for the meal and for their kindness. It’s also a good idea to send a thank you card the day after.

Rose

Which of the following is NOT proper for joining in a dinner party().

A．Get there 15 minutes earlier.

B．Make yourself at home.

C．Follow others to use forks and knives.

D．Thank your friends for the meal.

心脏内传导速度最快的部位是（）。

A.窦房结

B.心房肌

C.心室肌

D.房室交界

E.浦肯野纤维

自我中心是指个体不能区别一个人自己的观点和别人的观点，不能区别一个人自己的活动和对象的变化，把注意集中在自己的观点和自己的动作现象上。