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【单选题】
甲型流感病毒容易引起大流行的主要原因是其病毒容易发生抗原转变，出现抗原性完全不同的新亚型，变异由量变积累为质变。当新的流感病毒亚型出现时，人群普遍对其缺乏免疫力，因而容易引起大流行，甚至世界大流行。甲型流感病毒抗原小幅度变异称为（）
A.
溶原性转换
B.
抗原性转换
C.
抗原性漂移
D.
H-O变异
E.
W-V变异
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举一反三
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B.
1.0
C.
2.0
D.
3.0
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【单选题】Our ancestors have passed on to us the wisdom that to ensure the long-lasting prosperity of a country, we must show tolerance towards those who _________ along revolutionary paths.
A.
strike
B.
strike out
C.
strike on
D.
strike in
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【单选题】Text AII. Choose the right meaning for each underlined part according to the context.We must strike at its roots which spawn hate, brutality and the senseless destruction of human lives.
A.
escalate
B.
trigger
C.
spread
D.
widen
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【单选题】比杆赛中,在沙坑击球后后,球碰到站在沙坑边同组球员的球童,弹回沙坑时又滚到了自己的脚边碰到了脚上,把脚挪开时球了又滚动了半码左右,把球捡起来放回了原位,他受到的处罚是()
A.
罚两杆
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罚一杆
C.
罚三杆
D.
罚四杆
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1
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3
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【简答题】Our ancestors have passed on to us the wisdom that to ensure the long-lasting prosperity of a country, we must show ________ those who ________ along reolvutionary paths. Such people, with their new i...
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【简答题】To ensure a steady growth in our national __________ , we must __________ effort to stimulate our __________ demand and __________ saving and consumption. (domestic, economy, earnest, strike a balance...
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【单选题】We must __________ the rivers which overflow annually. Otherwise floods will frequently strike the areas along the rivers.
A.
harness
B.
make use of
C.
take advantage of
D.
utilize
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【简答题】Our ancestors have passed on to us the wisdom that to ensure the long-lasting prosperity of a country, we must show __________ those who __________along revolutionary paths. Such people, with their n...
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【简答题】Our ancestors have passed on to us the wisdom that to ensure the long-lasting prosperity of a country, we must show ____those who ____along revolutionary paths. Such people, with their new ideas and p...
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