下列关于cDNA叙述正确的是A．与模板链互补的DNA B．与编码链互补的DNA C．

病鸡脑组织病变的机制是（）（P224-35）

A、缺乏性梗死

B、干酪样坏死

C、蜡样坏死

D、液化性坏死

E、湿性坏死

在下列做法中，不正确的是()。

A．发现火灾后，立即拨打119．报警

B．报警同时，开启消防电源

C．扑救液体物品火灾，使用灭火器、沙土、湿的棉被等，不可用水

D．组织幼儿灭火

     Many people have heard stories of the California gold rush during the 19th century, when lots of

people went there in search for gold. Panning (淘洗) for gold has a rich and interesting history.

Nowadays some people continue to pan for gold in California. Although it cannot be regarded as a

method for earning income, taking on gold-panning as a hobby can give you a feeling of being in the old

west and get you out into nature.

     The only tool that is required to pan for gold is a gold pan. You can use a regular old flat pan, but

"officially" gold pans are quite cheap so you may as well buy one that is made for the task. Most sold

pans come in either plastic or metal.

     Once you have your pan you will want to start practicing your gold panning technique. Panning for

gold works because gold is much heavier than most rocks. To pan for gold you add rock and dirt form

the bottom of a stream to your pan and then gently let water flow through the pan. The lighter-weight

rocks are slowly swept away while any gold will be left behind in the pan.To start panning for gold, first

you will need to find a good location. Try checking maps of your area and old history books to find

location where there were gold mines in the past. Even though most of the gold have already been

removed, there are likely to be small leftovers that you can find. Once you have found an area that looks

promising, look for any small stream or river where you can try out panning for gold.

     Panning for gold requires patience and it may be a long time before you hit anything of value. However, it is an enjoyable hobby and provides a great opportunity to get outdoors, so don't give up too quickly.

1. What is Paragraph 3 mainly about?

A. Where to pan for gold.

B. How gold-panning works.

C. What tools are needed.

D. A promising area for panning.

2. What is the author's attitude toward modern gold-planning?

A. Opposed.

B. Indifferent (漠不关心的).

C. Positive.

D. Neutral (中立的).

3. In which part of a newspaper would you probably find this article? 

A. Lifestyle.

B. Health.

C. Travel.

D. Sports.

现代空袭作战的特点主要体现在全天候、全纵深和什么打击（）

A.全方位

B.全地域

C.全时空

下列哪一项不是瘀血阻络胁痛的特点（）。

A.胁肋刺痛

B.胸闷腹胀

C.痛有定处

D.入夜痛甚

E.舌质紫暗