在“寻此二途，阴阳报施，岂诬也哉”中，“寻”之义为（） A.探求 B.寻找 C.运用

图1为某家族两种遗传病的系谱图，已知这两种遗传病均为单基因遗传病，现已经确定至少有一种是伴性遗传，且Ⅱ-1是甲病的携带者。假设控制甲病的基因为A/a，控制乙病的基因为B/b。

(1)甲病的遗传方式是_________，乙病的遗传方式是__________。

(2)假设甲病在人群中患病的概率为1/10000，则Ⅲ-6患甲病的概率为__________。

(3)Ⅲ-4的X染色体来源于第1代中的___________。

(4)写出Ⅲ-2的基因型：__________。

(5)如果Ⅲ-1与图2所示的体细胞中控制甲乙两种遗传病基因分布情况的某女性婚配，他们的后代中患甲病的概率是__________患乙病的概率是___________，正常的概率是__________。

(6)采用_________的措施，可估计遗传病的再发风险率并提出预防措施；采用________的措施，可确定胎儿是否患有某种遗传病或先天性疾病。

在免疫应答过程中，巨噬细胞

A．产生抗体
B．表达TCR
C．产生细胞因子
D．表达CD8分子
E．发生基因重排

Questions 21 to 25 are based on the following passage.

Lead deposits, which accumulated in soil and snow during the 1960’s and 70’s, were primarily the result of leaded gasoline emissions originating in the United States. In the twenty years that the Clean Air Act has mandated unleaded gas use in the United States, the lead accumulation worldwide has decreased significantly.

A study published recently in the journal Nature shows that air-borne leaded gas emissions from the United States were the leading contributor to the high concentration of lead in the snow in Greenland. The new study is a result of the continued research led by Dr. Charles Boutron, an expert on the impact of heavy metals on the environment at the National Center for Scientific Research in France. A study by Dr. Boutron published in 1991 showed that lead levels in arctic (北极的) snow were declining.

In his new study, Dr. Boutron found the ratios of the different forms of lead in the leaded gasoline used in the United States were different from the ratios of European, Asian and Canadian gasolines and thus enabled scientists to differentiate (区分) the lead sources. The dominant lead ratio found in Greenland snow matched that found in gasoline from the United States.

In a study published in the journal Ambio, scientists found that lead levels in soil in the Northeastern United States had decreased markedly since the introduction of unleaded gasoline.

Many scientists had believed that the lead would stay in soil and snow for a longer period.

The authors of the Ambio study examined samples of the upper layers of soil taken from the same sites of 30 forest floors in New England, New York and Pennsylvania in 1980 and in 1990. The forest environment processed and redistributed the lead faster than the scientists had expected.

Scientists say both studies demonstrate that certain parts of the ecosystem (生态系统) respond rapidly to reductions in atmospheric pollution, but that these findings should not be used as a license to pollute.

How did scientists discover the source of lead pollution in Greenland? （）

A.By analyzing the data published in journals like Nature and Ambio.

B.By observing the lead accumulations in different parts of the arctic area.

C.By studying the chemical elements of soil and snow in Northeastern America.

D.By comparing the chemical compositions of leaded gasoline used in various countries.

孙某在甲企业申请注册为注册安全工程师。当地另有一家从事安全生产中介服务的乙公司，欲聘请孙某在乙公司兼职从事安全技术服务工作。依据《注册安全工程师管理规定》，下列关于孙某受聘的说法中，正确的是()。

A．孙某受聘于甲企业，不能从事任何兼职活动

B．孙某可以接受聘请，但不能以乙公司注册安全工程师名义执业

C．孙某在乙公司申请注册后，可以以乙公司注册安全工程师名义兼职执业

D．孙某在征得甲企业同意之后，可以以乙公司注册安全工程师名义兼职执业

下列全部位于生物圈之内的是：（）

A.大气圈

B.水圈

C.土壤

D.岩石圈