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【简答题】
手册属于下列哪种类型的文献?() A三次文献 B一次文献 C二次文献 D零次文献
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反馈参考答案：
举一反三
【单选题】德智体美全面发展
A.
with revolutionary/lofty ideals, sound morals，good education and a strong sense of discipline
B.
a rounded development of the students morally, intellectually ,physically and aesthetically
【单选题】It only takes a fraction of a second for the computer to do the____which used to take days.
A.
conclusion
B.
experiment
C.
explanation
D.
calculation
【多选题】Monogenic disorders also tend to be very rare, affecting only a fraction of one percent of the human population. This low prevalence can be attributed to a number of factors.
A.
First, many of these diseases are “early onset,” meaning that affected individuals die early in life, often before reproducing. The disease-causing alleles carried by these individuals are thus eliminated from the gene pool.
B.
At the same time, because many monogenic disorders are recessive, heterozygous individuals typically lead normal lives and show no signs of the disease. Thus, the diseasecausing alleles are never entirely eradicated from the population, and instead persist at a low frequency.
C.
The disease then manifests itself only in those rare individuals who inherit two mutant alleles. Monogenic disorders can occur more frequently, however, in families or populations in which the parents are genetically related.
D.
Such consanguineous marriages are more likely to produce offspring that are homozygous for the mutant, disease-causing alleles than are marriages between unrelated individuals.
【简答题】We have ________ renewable energy potential but we use only a fraction of it.
【单选题】With ____, payment is on the honor system, so authors collect only a fraction of the money they deserve for their programming efforts.
A.
shareware
B.
freeware
C.
demoware
D.
public domain software
【简答题】adv. 因此,所以 co_____
【单选题】She’s careful with her money, and spends only a fraction of her earnings.
A.
number
B.
sum
C.
portion
D.
dime
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