单项选择题

1923年中共“三大”就国共合作问题决定
A
共产党员以个人身份加入国民党

B
帮助国民党改组,使之成为民族资产阶级政党
C
同国民党实行党外合作
D
必须坚持共产党在革命统一战线中的领导权

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答案：正确

单项选择题

‏Which would qualify as a dominant allele of a gene?‍

A．an allele that confers a normal phenotype under some conditions, but confers a different, mutant phenotype when conditions such as elevated temperature are present
B．an allele that confers a phenotype only when both copies of the gene are mutant; that is, when homozygous
C．an allele that is commonly found in wild populations, as opposed to alleles found in laboratory strains or when a pathological condition is present
D．an allele that confers a phenotype on the organism when heterozygous; that is, when present in only one copy