调制解调器(Modem)的作用是______。A．将计算机的数字信号转换成模拟信号

阅读理解。

     New findings from Queen's University biologists show that in the plant world, bigger isn't

necessarily better.

     "Until now most of the thinking has suggested that to be a good competitor in the forest,

you have to be a big plant," says Queen's Biology professor Lonnie Aarssen. "But our research

shows it's virtually the other way around."

     Previous studies showed that larger plant species monopolize(垄断) sunlight, water and

Other resources, limiting the number of smaller plant species that can exist around them. But

the research has proved that this is not generally the case in natural vegetation.

     In the Queen's project, PhD student Laura Keating targeted the largest "host plants" of 16

woody plant species growing in the Okanogan Valley, British Columbia. The research team

calculated the number and variety of plants that neighbored each large host plant. They then

randomly selected plots without host plants and calculated the plant species there as well. The

research showed that the massive trees have no effect on the number of species with which they

coexist.

     Smaller plants have many advantages over their overbearing neighbors, Professor Aarssen

notes. Larger species generate physical space niches(生态位)under their shelters where smaller

species grow well. Smaller plants are much more effective than large trees at using available

resources. They also produce seeds at a much younger age and higher rate than their bigger

counterparts, and settle down much more quickly-thus competing with the newly-born plants

of larger species.

1. What's the main idea of the text?

A. Smaller plants may have many advantages over their neighbors.

B. In the plant world, the bigger is better than the smaller one.

C. To be a good competitor in the forest, you have to be a small plant.

D. Queen's University's students made a new research.

2. The underlined word "this" in Para.3 refers to the view that ____.

A. large and small plants can grow together in harmony  

B. larger plant species limit their smaller neighbors' growth

C. small plant species have their own advantages

D. large and small plant species can never coexist.  

3. What does the underlined word coexist mean in paragraph 4?

A. cooperate together  

B. surround together  

C. evolve together  

D. live together

4. Which is the CORRECT order in the Queen's project?

a. Randomly selected plots without host plants and-calculated the plant species.

b. Calculated the number and variety of plants that neighbored each large host plant.

c. Selected the largest individuals or "host plants" of 16 woody plant species.

A. a, b, c          

B. c, b, a        

C. b, c, a        

D. a, c, b

5. What can we learn according to the text?

A. Larger plant species limit the number of smaller ones around them.  

B. Smaller plants can limit the number of plant species around them.

C. Smaller plants produce seeds at a higher rate than their bigger counterparts.

D. Larger trees are more effective than small plants at using available resources.

实务3

您是宏远公司行政秘书高叶，下面是行政经理苏明需要您完成的任务。

病历摘要：患者男性，38岁，右眼前有黑影漂动十天伴下方视物不清七天，不伴有红肿及眼痛症状，否认有眼外伤史，但有高度近视史约十年，家族中无类似病史。

如采用治疗，你认为采用何种措施为妥？（）

A.眼内玻璃体切除联合眼内硅油填充术

B.眼内激光治疗

C.中药治疗为主

D.大剂量应用激素消炎

E.大剂量应用抗菌素

F.玻璃体内注射击曲安奈得等药物

G.玻璃体切割、眼内重水注入与眼内激光光凝等综合治疗

H.让病者自然恢复

I.拆除原手术带重新环扎一次

我国人民币采用同色异谱油墨印制，其特征是在（）下，就会发亮或变成另一种颜色。

A、红外线灯光

B、紫外线灯光

C、日光灯灯光

D、太阳光