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【单选题】
β地中海贫血最主要的发病机制是A.
点突变
B.
基因缺失
C.
mRNA前体加工障碍
D.
融合基因
E.
染色体易位
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【单选题】If natural gas produced in the U.S. was exported to countries in Asia and Europe, what factor would likely increase the price of that natural gas in the importing countries?
A.
The U.S. would impose export charges on each unit of natural gas exported and those charges would be passed along to the importing countries.
B.
Exporters in the U.S. would arbitrarily inflate the costs of production so that the importing countries would pay higher prices.
C.
Importing countries would impose tariffs on the imported natural gas and those tariffs be passed along by exporting companies to importing countries.
D.
Natural gas from the U.S. would have to be liquefied and transported in specially- designed ships to Asia and Europe, so transportation costs would increase the price of the imported natural gas in Asia and Europe.
【单选题】When estimating expenses for a budget,
A.
last month's and last year's expenses are not a good starting point.
B.
many of the same expenses do not occur each month.
C.
large unusual expenses such as car or hospital bills should be included.
D.
estimating your future assets is a good starting point.
【单选题】Piles of dung can't be relied upon when it comes to estimating elephant numbers because
A.
they are different in size
B.
they scatter all over the region
C.
they are different in decay rate
D.
they are different in quality
【单选题】Piles of dung can’t be relied upon when it comes to estimating elephant numbers because
A.
they are different in size
B.
they scatter an over the region．
C.
they are different in decay rate．
D.
they are different in quality．
【简答题】高压断路器依靠所配属的（）完成分、合闸操作。
【简答题】Piles of dung can' t be relied upon when it comes to estimating elephant numbers because.
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