简述豚鼠角膜注射法。

持续性白细胞增高常见于（）
持续性白细胞降低常见于（）
暂时性白细胞降低常见于（）

A.伤寒或副伤寒

B.再生障碍性贫血

C.缺铁性贫血

D.恶性肿瘤晚期

E.严寒的刺激

简述DDN网中本地网的含义。

同步发电机失去（）的运行方式，称为（）运行。

A controversial decision on whether choice cuts of steak and cartons of milk produced from cloned animals are suitable for the dinner table is now long overdue.

Hundreds of pigs, cows and other animals created with the help of cloning are living (1) farms across the United States and (2) the forthcoming ruling will directly (3) American consumers, British holidaymakers may also (4) themselves at the forefront of a food revolution that many commentators expect will (5) arrive here.

(6) the birth of Dolly the sheep-the first mammal cloned from an adult cell--there were extreme predictions of herds of genetically (7) bulls and pastures (8) with cloned dairy cows.

That double (9) of the past decade has not yet been realized (10) clones have become a familiar sight at agricultural fairs in America, where producers of (11) pigs and cattle have been among the first to (12) cloning, which offers a way to keep (13) traits without inbreeding problems caused by traditional methods. Clones of rare and elite animals, including sheep, goats, and rabbits, (14) a way to improve animal healthy, (15) the nutritional value of meat and milk, and breed animals immune (16) diseases or better suited for developing countries.

The safety of cloned (17) has been under examination by various bodies. Three years ago the US National Academy of Science concluded that (18) available data indicated that cloning met animal welfare and food safety considerations, more information was needed. (19) scientific evidence suggests that there is little (20) for alarm, at least on food-safety grounds.

19（）

A．propose

B．offer

C．exhibit

D．present

以下关于纳税审查方法优缺点说法正确的有（）。

A.顺查法的优点是比较系统、全面，运用简单，可避免遗漏；缺点是工作量大，重点不突出

B.详查法的优点是能保证质量，但工作量大

C.抽查法的优点是提高效率，而且没有风险

D.比较分析法可发现存在问题的线索

E.控制计算法可独立发挥作用，不需要配合其他方法