科学家以精确的实验证明（）是遗传物质.A.蛋白质 B.DNA C.染色体

设集合S_n＝{1,2,3，…，n}，若X⊆S_n，把X的所有元素的乘积称为X的容量(若X中只有一个元素，则该元素的数值即为它的容量，规定空集的容量为0)．若X的容量为奇(偶)数，则称X为S_n的奇(偶)子集．则S₄的所有奇子集的容量之和为________．

第Ⅱ组：重点选做题

简述中国古代的“九州”。

我想说的都是真话，但真话我未必都说。
如果上述断定为真，则以下各项都可能为真，除了( )。

A．我有时也说假话

B．我不是想啥说啥

C．有时说某些善意的假话并不违背我的意愿

D．我说的都是我想说的话

"Bad eyesight" A young man was called up for army service, but he didn’t want to become a soldier. When he went for his medical exam, ____(16)____ The doctor pointed to the eye chart on the wall and said," ____(17)____ " "The doctor line of what"the young man asked. " ____(18)____ "the doctor replied. "What chart"the man asked. " ____(19)____ "the doctor said. "What wall"the man said, Finally,the doctor decided that the man’s eyes were not good enough for army service. That evening the same young man was at a movie when another man came in and sat next to him in the dark. When the light went out, the young man saw that his neighbor whohad examined him earlier. Immediately he said,"Excuse,madam, ____(20)____ "

20().

A. but does this bus go to Main Street

B. The one on the wall.

C. he pretended that his eyesight was very bad.

D. Please read the top line.

E. he passed the exam.

F. Shall we go to the movies

G. The top line of the chart.

李某是某安全咨询机构的注册安全工程师，受某化工厂委托开展事故隐患排查工作。李某发现液氨罐区正在实施装卸作业，同时交叉有焊接和切割作业，并且所使用的临时发电设备不防爆，在这种情况下，依据《注册安全工程师执业资格制度暂行规定》，李某有权()。

A．制止装卸作业，并对作业人员实施处罚

B．制止焊接和切割作业，并对作业人员实施处罚

C．立即向该工厂报告，并亲自组织人员撤离

D．立即向该工厂报告，并建议停止现场作业