热水锅炉投运前，为防止停电、停泵时发生水击事故，检查循环水泵出入口之间应设置（）的旁

I bought a new sweater last weekend. It _______ me 120 yuan. [ ]

A. paid

B. take

C. cost

D. spent

明政府的盐务政策决定了政府必须和商人进行交易，但政府似乎从来没有意识到自己和商人之间是一种契约关系，在其看来，国家高高在上，每个国民都有为其作出牺牲的义务。商人被期望自愿地参与政府活动，而且产生利税。当无利可图、没有人愿意经销食盐时，政府会征召商人去完成这项任务，就如普通百姓需要承担各种徭役一般。事实上，商人在同政府交易时承担一些损失被认为理所当然，官员们可能认为这种损失在一定程度上是特许经商的费用。根据这段文字，文中“特许经商的费用”是指()。

A．政府和商人交易所需费用

B．盐商进行食盐专卖的代价

C．盐商获得利润的必要成本

D．盐商经销食盐所缴纳的赋税

安全措施应该与风险等级相适应，对于可容许的风险，其对应的安全措施是( )。

A．不需要另外的控制措施

B．直至风险降低后才能开始工作

C．必须禁止工作

D．必须有进一步的评价

In jokes, the chicken only crosses the road. In Australia, cane toads (蔗蟾) use roads to travel.

A new study finds that Cane toads are using roads to spread across the continent.   They take shelter overnight close to the open corridors (走廊), and then hit the road each evening in their damaging way.

Cane toads were brought into Australia from Hawaii in 1935 to control the spread of beetles (甲虫) that were destroying Australia's sugar cane crop. They are now moving into new places at the speed of 30 miles a year.

Toads can grow as large as dinner plates and can weigh up to 4.5 pounds. Their heads and backsides are covered with rows of warts (疣). They are known to kill snakes, lizards and other animals, including pet dogs. They have no natural enemy in Australia.

According to a research, toads make slower progress through thick plants than along open spaces and they hop (跳) alongside roads and fences whenever possible. Toads use long corridors that are well-suited for them to travel long distances.

Another study recently found that toads have evolved (进化形成) longer legs in recent years and that this is also helping them in their spread.

Efforts to kill toads have been largely unsuccessful, although scientists tried their best.  

Another new finding suggests ways to slow down its population.  For example, roadside borders can be changed to make them less attractive to toads, or allowing thick plants to grow along the sides of highways, thus forcing toads onto the road of themselves.

小题1: Which would be the best title for the passage?

A．Ways to kill cane toads in Australia.

B．Cane toads have evolved a lot in Australia.

C．Australian cane toads hit the road.

D．Worse environment forces toads to travel.小题2: At first, cane toads were brought to Australia to_______.

A．kill snakes, lizards and other animals

B．stop pet dogs from spreading

C．protect the sugar cane crop

D．hate a scientific research小题3:According to the passage, the ways to slow down the population of toads are based on the fact that cane toads_________.

A．move slower through thick plants

B．have no natural enemy in Australia

C．mainly live near the roadside

D．like traveling at night小题4:The underlined word "They" in Paragraph 3 refers to “________”.

A．Beetles

B．Cane toads

C．Australia's sugar cane crop

D．New places

维生素A制成微囊的目的是（）。

A．降低介电常数使注射液稳定 

B．防止药物水解 

C．防止药物氧化 

D．降低离子强度使药物稳定 

E．防止药物聚合