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【单选题】
自甲型H1N1流感疫情以来，全球多个国家都难以幸免。国外疫情一经发布，国务院及时组建甲流联防联控工作组，建立了疫情直报制度和信息公开制度。拨出相当经费迅速研制疫苗。对甲流重症救治，其费用纳入国家医疗保障制度支付框架中去。国产甲型H1N1疫苗将由政府埋单，此项财政支出主要来源于税收收入。这说明（） ①我国税收取之于民，用之于民 ②税收是国家职能实现的物质基础 ③在我国，国家利益、集体利益和个人利益是完全一致的 ④税收具有无偿性的基本特征A.
①②③
B.
①③④
C.
②③④
D.
①②
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【单选题】Which of the following statements best supports the claim that organisms share fundamental processes as a result of evolution?
A.
All organisms that are introduced into new environments have the capacity to fill vacant ecological roles.
B.
All organisms have the ability to utilize oxygen to harness energy from the chemical breakdown of organic compounds.
C.
All organisms share a genetic code organized into triplet codons, making it possible for one organism to express a gene from another organism.
D.
All organisms possess structures such as chloroplasts and mitochondria within their cells that reflect past symbiotic relationships between prokaryotic precursors.
【多选题】Commonly used reporter genes that induce visually identifiable characteristics usually involve fluorescent and luminescent proteins, including:
A.
the gene that encodes jellyfish green fluorescent protein (GFP), which causes cells that express it to glow green under blue light
B.
the enzyme luciferase, which catalyzes a reaction with luciferin to produce light
C.
the red fluorescent protein from the gene dsRed
D.
the
E.
coli lacZ gene, which encodes the protein β -galactosidase. This enzyme causes bacteria expressing the gene to appear blue when grown on a medium that contains the substrate analog X-gal
【单选题】某文件的权限是 -rwxr--r-- ,则下面描述正确的是
A.
文件的权限值是 755
B.
文件的所有者对文件只有读权限
C.
其他用户对文件只有读权限
D.
同组用户对文件只有写权限
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