贯彻科学发展观，做好工程咨询工作，对于( )具有重要意义。 A．维护群众正当利益

Paul Nicklen waited patiently on a sheet of ice in the Arctic.  He was there to take pictures for National Geographic. Finally, he saw something big and white. It was a polar bear, swimming towards him in the icy water.

Paul lay down-on the ice to get a better photo, but the polar bear jumped out of the water and tried to attack him! Luckily for Paul, the ice cracked or broke and the bear fell back into the water The polar bear wasn’t so lucky. It couldn’t get a meal and had to swim farther away to find food.

To understand the polar bear’s problem, you need to know two things about the Arctic. First, the Arctic is mostly ocean. Second , ice cover a lot of the Arctic Ocean. In winter, the ice form a thick, white sheet, but in summer, the ice becomes thinner and break into pieces. Sea ice is the key to survival for Arctic animals. However, because of global warming, Arctic temperatures are rising and polar ice is melting.

Polar bears need ice to hunt seals, their favourite meal. They stand on the ice wait for the seal to come up for air. As Arctic ice melts, polar bears have to swim farther to find ice floes, or large pieces of floating ice. Sometimes, bears have to swim more than 200 km to find an ice floe. Some bears cannot swim that far and sadly they drown.

On his last trip, Paul Nicklen saw three dead bodies of polar bears. Before global warming threatened Arctic ice, a dead bear was a rare sight, Paul is sad to see the dead bodies, wildlife experts thinks global warming will have a terrible effect on polar bears. In the future, polar ice will continue to shrink and endanger the bear. Some scientists believe 65 percent of the world’s polar bears will disappear by 2050. in other word, polar bears are in great danger.

小题1: The main idea of the passage is that_________.

A. polar bears are amazing swimmers          

B. Arctic temperatures are rising

C. global warming is endangering polar bears

小题2:The polar bear that tried to attack Paul was unlucky because

A. Paul swam away                       

B. it was on an ice floe

C. it couldn't eat Paul

小题3:According to the passage, polar bears hunt seals by______ .

A. waiting on the ice                       

B. waiting in the water

C. drowning the seals

小题4: From the passage, Paul Nicklen is maybe a_________.

A. scientist                 

B. photographer   

C. Psychologist

小题5:  We can infer that polar bears____________.

A. won't have any food in 2050        

B. will all die before 2050

C. cannot find food easily

如图所示是测定小灯泡额定功率的实物连接图，其中电源是三节新的干电池，灯泡额定电压是3.8V，其灯丝电阻约是10Ω，滑动变阻器上标有“10Ω 1A”的字样，电流表（0～0.6A、0～3A），电压表（0～3V、0～15V）。

（1）请你画出缺少的电路元件，并用笔画线代替导线将电路中未连接的部分连接好，使它成为完整的实验电路。（2分）

（2）小刚合理地连接好电路，并按正确的顺序操作，

但闭合开关后灯不亮，聪明的小刚猜想：

A.可能是灯丝断了   B.可能是滑动变阻器开路

C.可能是小灯泡短路  D.可能是电流表开路

根据小刚的猜想，请你借助图中的电流表和电压表验证小刚的猜想，将电流表、电压表的示数填入下表：

（3）假如电压表0～15V量程已损坏，小雨仍想测出小灯泡的额定功率，请你将小雨设计的电路图画在下面的方框内。（1分）

（4）按小刚新设计的电路图调节滑动变阻器，使电压表示数达到     V，小灯泡正常发光，此时电流表示数如图所示，则小灯泡的额定功率是     W。（2分）

我国历史上第一部独立的民法典是( )。

A．大清民律草案

B．现行律民事有效部分

C．中华民国民法

D．民律第二次草案

压力容器（）至少一次外部检验。

A.每年

B.每二年

C.每三年

D.每四年

变压器的一、二次电流之比可近似认为与一、二次侧绕组匝数比成反比。