扣件式钢管脚手架在搭设封顶时，其外排立杆顶端，平屋顶必须超过女儿墙顶（），并绑扎两道

小利等同学按如图甲所示电路来探究“通过电阻的电流与其两端电压的关系”．已知电源电压为8V，定值电阻R₁=20Ω．

（1）根据图甲用笔画线代替导线，将图乙中实物电路连接好．要求滑动变阻器滑片P向右移动=时，电流表示数变小．

（2）连接完电路后，闭合开关，发现电流表指针不偏转，电压表有示数，则故障可能是______．故障排除后，在实验中发现无论怎样调节滑动变阻器，电流表示数变化不大，他们认为出现这种情况的原因可能是滑动变阻器选择不合理．现有如下A、B两种滑动变阻器可供选择，那么他们应选择______（选填“A”或“B”）

A、100Ω、1A            B、5Ω、2A

（3）实验中小利将实验所得数据描绘在图丙中，则图中阴影部分面积表示的物理量是______．

酶活性测定方法中平衡法又称为（）

A.中止反应法

B.终点法

C.动力学法

D.速率法

E.连续检测法

以下提供若干个案例，每个案例下设若干考题。请根据各考题题干所提供的信息，在每题下面的A、B、C、D、E五个备选答案中选择一个最佳答案。

原发病最可能是

A．肾病综合征，肺血栓形成

B．急性肾炎伴支气管肺炎

C．急性肾小球肾炎，高血压

D．急性肾小球肾炎，严重循环充血

E．急性肾小球肾炎，肾功能衰竭

American beekeeping operations have been hit hard by what scientists call colony collapse disorder(C.C.D.). Almost half of their worker bees have disappeared during the past season. C.C.D. has also been reported in Israel, Europe and South America. Bees fly away from the hive and never return. Sometimes they are found dead; other times they are never found. Many crops and trees depend on pollination （授粉） by bees to help them grow.

A new report says virus may be at least partly responsible for the disorder in honey bee colonies in the United States. This virus is called Israeli acute paralysis virus. It was first identified in Israel in 2004. Ian Lipkin at Columbia University in New York and a team reported the new findings in Science magazine. Doctor Lipkin says the virus may not be the only cause. He says it may work with other causes to produce the collapse disorder.

The team found the virus in colonies with the help of a map of honey bee genes that was published last year. They examined thirty colonies affected by the disorder. They found evidence of the virus in twenty–five of them, and in one healthy colony. The next step is further testing of healthy hives.

The researchers suggested that the United States may have imported the disorder in bees from Australia. They say the bees may carry the virus but not be affected.

The idea is that unlike many American bees, the ability of Australian bees to fight disease has not been hurt by the varroa mite（全球性的蜂虱）. This insect attacks honey bees, which could make the disorder more likely to affect a hive. Australian bee producers reject these suspicions.

And some researchers suspect that bee production in the United States is down mainly because of the weather. Honey bees gather nectar（花蜜） from flowers and trees. The sweet liquid gives them food and material to make honey. But cold weather this spring in the Midwest reduced the flow of nectar in many flowers. Many bees may have starved. Dry weather in areas of the country could also be playing a part.

Wayne Esaias is a NASA space agency scientist who keeps bees in his free time. He lives in central Maryland, where he has found that flowers are blooming a month earlier than they did in 1970, which may be partly responsible for the disorder. Wayne Esaias is organizing a group of beekeepers to document nectar flow around the country.

小题1:The researchers found the virus ______.

A．with the help of colony collapse disorder

B．by researching the causes of bee death

C．with the help of a map of honey bee genes

D．with the help of a scientist of NASA小题2:What is the passage mainly about?

A．American beekeeping industry has been strongly influenced by the bee disorder.

B．Studies are being carried out on the causes of the bee disorder, but questions remain.

C．How the causes of the bee disorder in U.S have been found.

D．The bee production in U.S is down because of Israeli acute paralysis virus.小题3:How many possibilities may be involved in the bee disorder according to the passage?

A．Three.

B．Four.

C．Five.

D．Six.小题4:We can infer from the passage that ______.

A．Israeli acute paralysis virus should be responsible for the disorder

B．the solution to the bee disorder will be found eventually

C．American bees are more likely to defend themselves than Australian bees

D．the crop and plant production in U.S may be influenced by the bee disorder

Ⅲ度房室传导阻滞伴短阵室性心动过速，首选：（）

A.利多卡因

B.阿托品

C.心室起搏

D.电复律

E.心房起搏