子程序通常分为两类： 【3】 和函数，前者是命令的抽象，后者是为了求值。

打开指定文件夹下的演示文稿yswg05(如图)，按下列要求完成对此文稿的修饰并保存。

(1)在第一张幻灯片的主标题处输入“万福社区医疗保健中心”，字体设置成加粗、54磅。插入第二张“标题和文本”幻灯片，标题处输入“服务项目”，文本处输入“牙科”。第二张幻灯片的文本部分动画设置为“进入效果温和型回旋”。 (2)使用“Kimono”演示文稿设计模板修饰全文；全部幻灯片的切换效果设置为“向下插入”。

Many earthquakes happen without warning, so it is important to know what to do when it happens. Here are some tips on how to stay safe in earthquakes.

◆Keep a cool head. Worry won’t help you. Think about what you should do. The first several seconds are important.

◆If you are indoors, stay inside and duck and cover. Hide under a desk or table, or stand in a corner. Cover your head and neck with your arms. Stay away from windows and anything that could fall on you.

◆If you are in a crowded(拥挤的) hall or shop, don’t rush for the door. You will find too many people trying to get out at the same time. Instead, lower(降低) yourself close to the ground and cover your head and neck with your hands and arms.

◆If you are outdoors, try to get into an open area away from buildings, trees or street lights.

◆If you are trapped in a place, you may make noises by knocking at the rocks. But don’t shout all the time. You could be without help for up to 72 hours. Try to find some water and food.

◆Stay in your seat if in a cinema or a theatre. Get below the level(水平线) of the back of the seat. Cover your head and neck with your arms.

◆Stay in a safe area until you are sure it’s OK to leave. Some aftershocks(余震) may follow. They are as dangerous as the earthquake.

小题1:The best title(题目) of the passage is ____________.

A．Advice for dangerous situations

B．How to keep calm in earthquakes

C．Ways to protect yourself in earthquakes

D．Be careful with aftershocks小题2:The underlined word “duck” in Tip 2 means _____________.

A．a water bird with short legs

B．some kind of meat for eating

C．walk like a duck

D．lower your head or body very quickly小题3:_________ should be the most important part(s) to be protected in earthquakes.

A．Your head and arms

B．Your head and neck

C．Your neck and arms

D．Your arms小题4:. From the passage we know that _________.

A．keeping calm is very important during the earthquake

B．we can hide under the tree during the earthquake

C．we don’t have to care about aftershocks

D．we should keep shouting for help if we are trapped

声音产生是由于物体振动，有振动就一定可以听到声音．______．

铈钨极与钍钨极相比具有的优点是（）。

A.弧束细长

B.热量不集中

C.烧失率高

煤的粘结性和结焦性之间有什么相同和不同之处？