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【多选题】
普萘洛尔可用于治疗A.
心律失常
B.
典型心绞痛
C.
高血压
D.
甲状腺功能亢进症
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【单选题】What is the main topic of the conversation?
A.
Food packaging.
B.
Varieties of fish.
C.
A new snack food.
D.
An artificial food flavoring.
【简答题】one that studies the stylistic features of the main varieties of l ,
【单选题】To survive in the intense market competition, we must ______ the qualities and varieties of products we make to the world-market demand.
A.
improve
B.
guarantee
C.
gear
D.
enhance
【简答题】联合国为了推动电子商务立法，通过的两个重要的法律文件是（）和（）。
【单选题】In the world, there are over 2, 000 varieties of snakes, ______ are harmless to humans.
A.
only they
B.
most of them
C.
most of which
D.
which most
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