单项选择题：下列程序段的执行结果为（）。　　I=4　　x=5　　Do　　　I=I+1

题型：单项选择题

In this section you will find after each of the passages a number of questions or unfinished statements about the passage, each with 4 (A, B, C and D) choices to complete the statement. You must choose the one which you think fits best. The time for this section is 75 minutes.

questions 1-5 are based on the following passage.
Non-indigenous (non-native) species of plants and animals arrive by way of two general types of pathways. First, species having origins outside the United States may enter the country and become established either as free-living populations or under human cultivation-for example, in agriculture, horticulture, aquaculture, or as pets. Some cultivated species subsequently escape or are released and also become established as free-living populations. Second, species of either US or foreign origin and already within the United States may spread to new locales. Pathways of both types include intentional as well as unintentional species transfers. Rates of species movement driven by human transformations of natural environments as well as by human mobility-through commerce, tourism, and travel-greatly exceed natural rates by comparison. While geographic distributions of species naturally expand or contract over historical time intervals (tens to hundreds of years), species-ranges rarely expand thousands of miles or across physical barriers such as oceans or mountains.
Habitat modification can create conditions favorable to the establishment of non-indigenous species. Soil disturbed in construction and agriculture is open for colonization by non-indigenous weeds, which in turn may provide habitats for the non-indigenous insects that evolved with them. Human-generated changes in fire frequency, grazing intensity, as well as soil stability and nutrient levels similarly facilitate the spread and establishment of non-indigenous plants. When human changes to natural environments span large geographical areas, they effectively create passages for species movement between previously isolated locales. The rapid spread of the Russian wheat aphid to fifteen states in just two years following its 1986 arrival has been attributed in part to the prevalence of alternative host plants that are available when wheat is not. Many of these are non- indigenous grasses recommended for planting on the forty million or more acres enrolled in the US Department of Agriculture Conservation Reserve Program.
A number of factors perplex quantitative evaluation of the relative importance of various entry pathways. Time lags often occur between establishment of non-indigenous species and their detection, and tracing the pathway for a long-established species is difficult. Experts estimate that non-indigenous weeds are usually detected only after having been in the country for thirty years or having spread to at least ten thousand acres. In addition, federal port inspection, although a major source of information on non-indigenous species pathways, especially for agriculture pests, provides data only when such species enter via closely-examined routes. Finally, some comparisons between pathways defy quantitative analysis-for example, which is more "important": the entry path of one very harmful species or one by which many but less harmful species enter the country

According to the passage, the US Department of Agriculture______.

A．is liable for the fast distribution of the Russian wheat pest

B．fails to isolate the Russian wheat aphid in limited locales

C．provides data about foreign species entering the country by regulated routes

D．is responsible for introducing harmful plants onto federal lands

查看答案

题型：解答题

口袋中有质地、大小完全相同的5个球，编号分别为1，2，3，4，5．甲先摸出一个球，记下编号为a，放回袋中后，乙再摸一个球，记下编号为b．

（Ⅰ）求“a+b=6”的事件发生的概率；

（Ⅱ）若点（a，b）落在圆x²+y²=21内，则甲赢，否则算乙赢，这个游戏规则公平吗？试说明理由．

查看答案

题型：单项选择题

ABC会计师事务所接受委托对T公司2009年年报进行审计，审计助理人员对资产类财务报表项目进行截止测试，注册会计师A对其审计进行指导、监督和复核，请代为进行判断。

银行存款截止测试的关键是( )。

A．审查当年各月的银行存款余额调节表

B．确定被审计年度企业开出的最后一张支票号码

C．审查当年各月的银行存款对账单

D．确定被审计单位当年记录的最后一笔银行存款业务

查看答案

题型：多项选择题

国际咨询工程师联合会(FIDIC)的目标主要是( )。
A．在国际上代表为建设和自然环境提供以技术为主的智力服务企业
B．作为世界范围工程咨询业的代言人
C．帮助其会员实现各自的政治利益
D．提高咨询工程师作为社会发展带头人和财富创造者的形象
E．实现对可持续发展起推动作用的承诺

A．在国际上代表为建设和自然环境提供以技术为主的智力服务企业

B．作为世界范围工程咨询业的代言人

C．帮助其会员实现各自的政治利益

D．国际咨询工程师联合会(FIDIC)的目标主要是( )。

E．实现对可持续发展起推动作用的承诺

F．提高咨询工程师作为社会发展带头人和财富创造者的形象

查看答案

题型：单项选择题

如右上图表示用燕麦胚芽鞘做的实验，A、B不给照光，C、D照右侧光，能够向左弯曲生长的是（）

A.A

B.B

C.C

D.D

查看答案

下列程序段的执行结果为（）。　　I=4　　x=5　　Do　　　I=I+1

题目：

答案：