监理单位应参与制订和监督施工阶段风险评估与管理工作，并检查风险处理措施的（）。

阅读理解。

     Cats and dogs are both popular pets. Cat owners think that cats are nicer pets in some ways. Cats are

cleaner, first of all. They keep themselves clean, and they do not make the house dirty. Cats are also quieter

than dogs. They usually do not make a lot of noise. Cats are safer, too. Dogs sometimes bite people, but cats

almost never do. Finally, cats are easier to take care of. You do not have to spend much time with a cat. In

fact, many cats prefer to be alone.

     Many children want to have a pet. Some parents may not like the idea of a dog or a cat in the house, but

pets can be good for children. A pet is fun for a child to play with. This can be especially important if there is

only one child. Also, children can leam a lot from a pet. They can learn about animals and the natural world.

Children also leam about taking care of something. They cannot forget about their pets. This is an important

lesson for all children.

     Most Americans think of cats as pets, but not all cats are pets. Some cats can help people, but others can

be problems. For example, on farms and in old houses, they kill small animals such as rats or mice. However,

some people do not want cats around. They like to watch birds in their yards. Cats may kill the birds or scare

them away. Cats can also be a problem in cities. In Rome, for example, thousands of cats live in the streets

and old buildings. They make a lot of noise, and they are dirty and dangerous.

1. The owners of cats think that cats are _____ than dogs.

A. safer but dirtier

B. cleaner but noisier

C. more interesting and safer

D. cleaner and quieter

2. Pets are good for children because _____.

A. pets are very popular

B. pets help children leam a lot

C. pets are easy to take care of

D. pets help children forget everything

3. We can learn from the last paragraph that _____.

A. cats can help on farms

B. cats and birds are friends

C. cats prefer living in cities

D. cats are thought as pets by all

把61万用科学记数法可表示为（　　）

A．6.1×10⁴

B．6.1×10⁵

C．6.0×10⁵

D．61×10⁴

关于燃料和热值，以下说法正确的是[ ]

A．燃料热值与燃料的质量无关

B．容易燃烧的燃料，热值一定大

C．煤的热值大于干木柴的热值，燃烧煤放出的热量比燃烧木柴放出的热量一定多

D．为了提高锅炉的效率，一定要用热值高的燃料

供能总量少，功率输出最快，时间仅能维持数秒钟的供能系统为（）。

A.磷酸原系统

B.乳酸能系统

C.有氧氧化系统

D.无氧系统

油中溶解气体检测中采样用的玻璃注射器的规格有（）。

A.100mL

B.50mL

C.5mL

D.1mL