试述有机磷农药中毒时用解磷定解救的机制。

对号入座（给下面加粗字选择正确的读音）。   

重（zhòng chóng）  得（de dé děi）  还（hái huán）  干（gān gàn）   

1．高考对于每个学生来说都很重（    ）要。   

2．老鹰（yīng）飞得（    ）真快呀！

3．丽丽从我家借的书，怎么还没有还（    ）给我？   

4．清洁工把大街小巷打扫得干干（    ）净净。   

5．大家的帮助让失学的儿童重（    ）返校园。

如图所示，灯L₁上标有“12V 8W”、L₂上标有“24V 12W”字样，电源电压为12V且保持不变，开关S闭合后（　　）

A．电流表A₁和A₂示数相同

B．电流表A₂示数为0.5A

C．电压表接法是错误的

D．灯L₁正常发光，且比灯L₂亮

在我国票据法上，对于本票的付款，仅在______期限上，做了与汇票不同的规定，而在其他方面则完全适用有关汇票付款的规则。

用于鉴别COPD和支气管哮喘的试验是（）

A.过敏原试验

B.支气管激发试验

C.低氧激发试验

D.运动试验

E.支气管扩张试验

Small, pink and very ugly. Hardly the qualities of a star, but they describe the deformed mouse that was the media darling at a recent science exhibition in Beijing. With a complex tissue structure in the shape of a human ear grafted on to its back, the rosy rodent was a stunning symbol of the serious strides China is making in the field of biotechnology.

China is fast applying the latest life-science techniques learned from the West to aggressively pursue genome research. It’s establishing its own centers of technical excellence to build a scientific base to compete directly with the United States and Europe. With a plentiful supply of smart young scientists at home and lots of interest abroad biotechnology is on the brink of a boom in China. And in the view of foreign scientists, Beijing is playing a clever hand, maximizing the opportunities open to them.

For the moment, the cooperation exists mostly with Europe and the U. S. But Asia’s other biotech leaders, Japan, Singapore and Korea, also are recognizing China’s potential as an attractive low-cost base to conduct research. These partnerships—and China’s advancement in the field of biotechnology—could help benefit the rest of Asia: China’s rapid progress in improving crop yields will address food-security concerns in the region. In addition, China is more likely to focus on developing cheap technology that its predominantly poor population and those of other Asian countries—can afford.

There remain, however, serious barriers to the development of a p biotech industry. Among them are a poor domestic legal framework, weak enforcement of intellectual-property rights and loose adherence to international standards. China is a signatory of the International Bio Safely Protocol, which should mean adherence to global standards governing the conduct of field trials. But some observers are skeptical. "The regulations look good, but I haven’t met one scientist who believes they are being fully adhered to," says a European science analyst.

If shortcuts are taken, then some of the recent scientific achievements trumpeted in the official press may never make it to market. But no matter how strict lab test are, other problems lie in wait. For example, there is a number of tasks it would take years to fulfill in the patents office, says one lawyer, leaving innovators with little protection if they take a product to market in China.

The phrase "on the brink of a boom" ( in boldface in Paragraph 2) in the context means ().

A. having an edge in competition

B. in great demand

C. on the way to success

D. preparing for challenge