【单选题】一个半综合征（one and a half syndrome）不可出现：

AIDS (Acquired Immune Deficiency Syndrome) is a fatal disease that destroys the immune system. More than four out of five AIDS cases in the United States so far have been homosexual or bisexual men or drug users. Not all those who are infected with the AIDS virus, now【B1】one and a half million Americans, will【B2】the disease, but scientists assume that【B3】of the virus can spread it to others through sexual【B4】or exchange of blood or other bodily fluids.

【B5】about the spread of the disease has brought demands for testing to【B6】evidence of infection. But proposals for testing have been【B7】with a storm of questions and counterproposals from health officials, advocates of civil rights, and【B8】right activists. Should testing of people at special risk be【B9】or mandatory(强制性的)? How wide should testing be? What uses will be【B10】of the results? If the secret is disclosed, is there a danger【B11】people discovered be carriers will lose their jobs, housing, and access【B12】public places?

At a meeting in February 1987, participants in a【B13】sponsored conference on the control of AIDS【B14】that testing should be voluntary and accompanied by safeguards to protect the【B15】of those who are tested. The consensus, 【B16】, was ruined by disagreements about definition of terms. One participant pointed【B17】that "mandatory", "routine"," standard", "required" and" confidential" were being used in different ways. As AIDS【B18】more victims—by 1991 health officials estimate that more than 50,000 Americans will die【B19】each year—public anxiety will mount and the demand for【B20】testing and control may grow. State Laws written in the 1920s and 1930s to limit the spread of sexually transmitted diseases may not be adequate to protect against AIDS. But it remains unclear whether new laws requiring mandatory testing would produce sufficient health benefits to justify possible violations of civil rights.

【B1】

A．numbering

B．amounting

C．counting

D．enrolling

A、baseball

B、hockey

C、hiking

D、swiming

A、phosphorylation

B、acetylation

C、methylation

D、ubiquitylation

How long was Dilys late?

A．Half an hour.

B．Twenty minutes.

C．One and a half hours.

【单选题】你的应用程序将允许用户从一个名为Widgets的表中删除记录. 这个表含有一个名为ComponentsID的主键，Widgets表中的每一行都跟ComponentsTable表中的若干行相关联，ComponentsTable表也包含一个名为ComponentsID的列.当你从Widgets表中删除一行后，你希望ComponentsTable表中与此相关联的行也自动的被删除掉. 你已经写了如下的一些代码（行号只是作为参照作用）： 01 Dim columnOne As DataColumn 02 Dim columnTwo As DataColumn 03 Dim myRelation As DataRelation 04 columnOne = MyDataSet.Tables("Widgets").Columns("ComponentsID") 05 columnTwo = MyDataSet.Tables("WidgetDetails").Columns("ComponentsID") 06 07 MyDataSet.Relations.Add(myRelation) 下列的哪一行代码该放在第6行？（选择一个最佳答案）

A、myRelation = New DataRelation(MyDataSet.Tables("Widgets"), columnOne, columnTwo)

B、myRelation = New DataRelation("WidgetsWithComponents", columnOne, columnTwo)

C、myRelation = New ForeignKeyConstraint(MyDataSet.Tables("Widgets"), columnOne, columnTwo)

D、myRelation = New ForeignKeyConstraint("WidgetsWithComponents", columnOne, columnTwo)

A、To let people have one more day off.

B、To show respect for soldiers’ contributions.

C、To organize fun activities for school children.

D、To celebrate America’s success in world wars.

A、nominal variables and real variables.

B、nominal variables, but not real variables.

C、real variables, but not nominal variables.

D、neither nominal nor real variables.

A、changes in the money supply have only indirect effects on aggregate spending.

B、changes in the money supply may have a direct effect on aggregate spending.

C、interest rates have no effect on money demand, implying the velocity is constant.

D、both (b) and (c) of the above are true.