几道英语选择题，选什么，为什么？？

Question

1.He raised his eyebrows and stuck his bead forward and _______it in a single nod,a gesture boys used then for O.K.when they were pleased.
A)jerked B)twisted C)shrugged D)tugged
2.In addition to the rising birthrate and immigration, the _____death rate contributed to the population growth.
A) inclining C) declining B) increasing D) descending
3.If you go to the park every day in the morning, you will _____ find him doing physical exercise there.
A) ordinarily C) logically B) variably D) persistently
4.Creating so much confusion, Mason realized he had better make _____ what he was trying to tell the audience.
A) exclusive C) objective B) explicit D) obscure
5.Sometimes the bank manager himself is asked to _____ cheques if his clerks are not sure about them.
A) credit C) certify B) assure D) access

Answer 1

D 我觉得答案有问题，因为jerk, tug都是拉的意思，shrug是耸肩，可能只有twist合理点，弯曲。
C 人口增长由于出生率上升，移民，还有死亡率下降，要用decline.
A 可能疑问会在A和D之间产生，但是看到他很平常，persistent是有坚持之意，不太合适。
B 意思是这么多疑问，这个人意识到最好把他要说得话解释清楚，explicit是清楚明白之意。
C certify有保证，确认之意,to certify a cheque,是保证兑现的意思。本回答被提问者采纳