铁剂治疗缺铁性贫血后，首先出现的治疗反应是（） A.红细胞总数升高 B.血清铁增加

煤是具有一定热值的均相固体可燃物。

Scientists are carrying __小题1:_____ experiments into using spiders’ cobweb to produce __小题2:____(extreme ) thin wire. The research _小题3:____( conduct) by researchers from Germany. They have developed __小题4:___process for reducing spiders’ silk _小题5:___about one twentieth of its normal diameter.

__小题6:___ is hoped that this new wire will be effective in the __小题7:____(grow) field of micro-electronics. They have collected data on the properties of spider silk. Their work has found evidence _小题8:____ the silk of the black widow spider would be the __小题9:____ (idea)material for the new “nanowires”. It seems even the deadly black widow can serve the cause __小题10:___ the scientific progress.

情景交际。根据对话内容，从方框内选出五个合适的句子补全对话。其中有两项是多余的

A: Good morning.      小题1:    

B: My name is Daming. And what’s your name?

A: I’m Jack Smith.

B: Hello, Jack!     小题2:     

A: No, I’m not. I’m from America.

B: Oh.    小题3:    

A: Yes, I am.

B: Oh, I’m in Shanghai International School, too.

A:     小题4:    

B:No, I can’t. But I can speak English.

A:    小题5:    

B: Yes, I can.

A: Great! We can play basketball together(一起).

下列说法正确的是（　　）

A．一块砖切成体积相等的两块后，砖的密度变为原来的一半

B．铁的密度比铝的密度大，表示铁的质量大于铝的质量

C．铜的密度是8.9×10³kg/m³，表示1m³铜的质量为8.9×10³kg

D．密度不同的两个物体，其质量一定不同

Internet的结构特点是 ______。

A．星型结构

B．层次化的树型结构

C．总线结构

D．分布式结构