A.Đột biến gen.
B.Đột biến đa bội.
C.Đột biến đảo đoạn.
D.Đột biến lặp đoạn.

A.ADN.
B.mARN.
C.tARN.
D.rARN.

A.who
B.where
C.that
D.which

A.earn
B.pay
C.count
D.charge

A.another
B.every
C.the other
D.other

A.variant
B.difference
C.divergence
D.variety

A.moreover
B.therefore
C.however
D.otherwise

A.Stopping the Two-child Policy in Vietnam
B.Raising the Retirement Age in Vietnam
C.How to Solve the Aging Population in Vietnam
D.Vietnam's Struggle against Ageing Population

A.Stopping the Two-child Policy in Vietnam
B.Raising the Retirement Age in Vietnam
C.How to Solve the Aging Population in Vietnam
D.Vietnam's Struggle against Ageing Population

A.tighten
B.strengthen
C.apply
D.weaken