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【单选题】
某反应物的半衰期为 20 天,反应进行 60 天后还有该纯物质质量是原来的 ( )A.
1/2
B.
1/4
C.
1/6
D.
1/8
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【单选题】New Foods and the New World In the last 500 years, nothing about people — not their clothes, ideas, or languages — has changed as much as what they eat. The original chocolate drink was made from the ...
A.
Food
B.
Clothing
C.
Ideology
D.
Language
【单选题】Jane always enjoys ______ to popular music at home on Friday evening.
A.
listening
B.
to listen
C.
being listening
D.
to be listening
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