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【多选题】
Social factors leading to drug abuse include (multiple choice) :A.
Availability of addictive substances
B.
Family factors.
C.
Peer influence, peer pressure
D.
Cultural background.
E.
social environment and other factors
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【单选题】有一染色体 a b c.d e f g 发生了结构变异而成为 a b f e d . c g ，这种结构变异称为（）。
A.
臂间倒位
B.
臂内倒位
C.
易位
D.
缺失
【多选题】What are the government's solutions to these housing problems?
A.
Local council provide free housing to those who are unable to buy their own homes.
B.
Local council provide council housing to those who are unable to buy their own homes.
C.
Tenants can buy their council homes at a discount of up to 60 per cent of the market price.
D.
Tenants can buy their council homes at the same price as that of the market price.
E.
For most people with low incomes and low savings, there are housing benefits to pay for rented accommodation.
F.
For most people with low incomes and low savings, there is barely any housing benefits to pay for rented accommodation.
【单选题】When solutions of strong electrolytes in water are formed, the ions are surrounded by water molecules. These interactions are best described as a case of __________.
A.
hydration
B.
supersaturation
C.
crystallization
D.
dehydration
E.
solvation
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