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【单选题】
集气瓶装气体,可能是下列气体中的某一种:1二氧化碳 2氧气 3空气 4氮气,将燃着的木条伸入瓶中,火焰立即熄灭,则该瓶气体可能是( ) lA.
①或②
B.
②或③
C.
①或④
D.
③或④
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【简答题】PTSD is a kind of disease in which the sufferers will show continual ______.
【简答题】[A] continuous [B] continual [C] unceasing [D] gradual
【简答题】continual
【单选题】The Norman Conquest started a continual flow of French words into English. _________ of them are still in use today.
A.
85%
B.
56%
C.
72%
D.
75%
【单选题】The rising water was a continual ____ to the city.
A.
thrill
B.
warn
C.
risk
D.
threat