20CrMnTi的含Cr量是（）。 A.0 B.1.5% C.10% D.20%

男性生殖系统包括_________、附睾、_________、精囊腺、_________、阴茎和阴囊等。_________是男性的生殖腺，是男性的主要性器官，其余器官是附属性器官。_________内能产生精子，精子呈蝌蚪形，有长尾，能游动。_________还能分泌雄性激素。

According to an English newspaper, scientists could begin cloning human embryos in Britain in 2001. It is understood that the government has already agreed to use Frankenstein’s technology, believing the benefits are more important than ethical （伦理的）concerns .Researchers think it will be possible to grow brain tissue to cure the diseases that are likely to get worse as time passes like Alzheimer’s , and produce “spare part” organs like hearts and kidneys for transplant （移植）.

Ministers are aware that the change in the law will be as controversial as the law which legalized abortion (堕胎）more than 30 years ago. Some politicians reacted angrily , arguing that the government had already made up its mind without discussion. Church leaders and anti-abortion campaigners have long expressed their horror at the plans, arguing that even the earliest embryos are forms of human life.They believe that getting an embryo from cells is morally unacceptable . And it will also cause arguments about how far scientists should interfere with nature and lead to accusations that they  are “playing God”.

The cloning of human embryos to provide spare parts is regarded by most experts to be the most important step forward in the 21^st century medicine. Scientists say treatment of diseases such as Alzheimer’s and Parkinson’s will be the first application of cloning. The ability to clone embryos was first achieved by scientists in Scotland in the late 1990s and now the ability to grow stem cells into tissues and organs is being developed by American researchers. Combining the two technologies will mean an end to long waits for organs from donors and problems caused by rejection (排异反应） of transplanted tissues by the body.

Ian Wilmut, the man who cloned Dolly the sheep, has warned that British experts will go to America, where such work is legal, if the government does not permit it.

小题1:The government has decided to allow scientists to clone human embryos because they think that ____.

A．Frankenstein’s technology is advanced

B．Its advantages are more important than its disadvantages

C．Diseases like Alzheimer’s are a serious problem in their country

D．They can make a lot of money from it小题2:The underlined word “they”in Paragraph 2 refers to ______.

A．Ministers

B．Scientists

C．Church leaders

D．Anti-abortion campaigners小题3:Which of the following statements is NOT true according to the passage?

A．Most experts think that the cloning of human embryos is beneficial.

B．Politicians were in favour of the government’s decision.

C．It is legal for scientists to clone embryos in America now.

D．American researchers are developing the ability to grow stem cells into tissues and organs.小题4:What’s the best title for this passage ?

A．Science of cloning.

B．Cloning and abortion

C．Cloning human embryos

D．the argument between politicians and scientists

假设某公司每年需外购零件4900千克，该零件单价为100元，单位储存变动成本400元，一次订货成本5000元，单位缺货成本200元，企业目前建立的保险储备量是50千克。在交货期内的需要量及其概率如下：

要求：

(1)计算最优经济订货量、年最优订货次数；

(2)按企业目前的保险储备标准，存货水平为多少时应补充订货；

(3)企业目前的保险储备标准是否恰当；

(4)按合理保险储备标准，企业的再订货点为多少？

为实现进度目标，不但应进行控制，还应注意( )，并在分析的基础上采取风险管理措施，以减少进度失控的风险量。

A．重视总进度目标的论证

B．选择合理的承发包模式

C．选用有利的设计和施工技术

D．分析影响工程进度的风险

国家委员会、州长会议和领导机构所作的公众报告都强调了公民更好地理解国际事务的极大必要性。如果一个国家要在国际竞争时代保持主导地位，这种必要性就是无可辩驳的。如果需要公民对国际事务更好地理解，那么我们所有的新教师都必须按国际方向来准备和教授他们的课程。 如果段落中所有的陈述都是正确的，下面哪一条也一定是正确的( )

A．如果一个国家要在国际竞争时代保持主导地位，那么新教师必须按国际方向来准备和教授他们的课程

B．如果新老师按国际方向来准备和教授他们的课程，那么这个国家在国际竞争时代就能保持主导地位

C．如果公民能更好地理解国际事务，那么这个国家在国际竞争时代就能保持主导地位

D．如果一个国家要在国际竞争的时代保持主导地位，那么就不需要公民们对国际事务有较好的理解