若x2+mx+16=（x+4）2，则m的值是（ ） A．4 B．8 C．-8 D

阅读理解。

     Do you know Australia? Australia is the largest island in the world. It is a little smaller than China.

It is in the south of the earth. Australia is big, but its population is not large. The population of Australia

is nearly as large as that of Shanghai.

     The government has made enough laws (法律) to fight pollution. The cities in Australia have got little

air or water pollution. The sky is blue and the water is clean. You can clearly see fish swimming in the

rivers. Plants grow very well.

     Last month we visited Perth, the biggest city in Western Australia, and went to a wild flowers'

exhibition. There we saw a large number of wild flowers we had never seen before. We had a wonderful

time. Perth is famous for its beautiful wild flowers. In every spring Perth has the wild flower's exhibition.

After visiting Perth, we spent the day in the  countryside. We sat down and had a rest near a path at the

foot of a hill. It was quiet and we enjoyed ourselves. Suddenly we heard bells ringing at the top of the

hill. what we saw made us pick up all our things and run back to the car as quickly as we could. There

were about three hundred sheep coming towards us down the path.

    Australia is famous for its sheep and kangaroos. After a short drive from any town. you will find

yourself in the middle of' white sheep. Sheep, sheep, everywhere are sheep.

1. Australia is ______.        

A. the largest country in the world    

B. as large as Shanghai        

C. is not as large as China           

D. the second largest island in the world

2. The government has made ______.        

A. too enough laws to fight pollution      

B. so many laws that it can fight pollution         

C. enough laws that it can hardly fight pollution,         

D. enough laws because the pollution in Australia is very serious

3. Which of the following is NOT true?

A. Perth is famous for its beautiful wild flowers.

B. Perth is bigger than any other city in Western Australia.         

C. Perth lies in the west of Australia.    

D. Perth is the biggest city in Australia.

4. Which of the following is TRUE?       

A. Australia is famous for its sheep. kangaroos and wild flowers.         

B. We ran back lo the car because we were in the middle of white sheep.         

C. Three hundred sheep came towards us because they saw us.

D. If you go to the countryside in Australia, you will see a large number of sheep.

对于门控心血池显像的质量控制，下列论述错误的是（）。

A.采用左前斜位显像是，无论患者的情况，最佳的角度都是30°～45°

B.科室需采用统一的图像处理标准，本底的ROI位置要相似

C.可以通过增加图像采集时间、增加注射剂量等方式来降低图像噪声

D.大约33％～50％的左室区域的放射性计数是由本底引起的，所以进行本底校正十分重要

E.最好采用手动法确定心室的边界ROI和本底ROI，这样计算的数据才准确可靠

下面几种总线中，数据传输速率最快的总线是

A．PCI 1.0

B．PCI 64b

C．AGP 8×

D．PCI-E×16

说明国家发展城市社区卫生服务宏观政策已经明确的标志是2002年8月23日出台的______。