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【单选题】
Press printing techniques first appeared in ____.A.
Germany
B.
Canada
C.
the United States
D.
China
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举一反三
【单选题】The availability of fixed nitrogen, an essential nutrient, may have limited the size of the primordial biosphere. As early cells acquired a capacity to fix atmospheric nitrogen, the biosphere expanded...
A.
2
B.
2.5
C.
3
D.
3.5
【单选题】以下语句,当 x=( )时,输出结果为True。 Print Sgn(Int(x) >= Fix(x) And Fix(x) >= CInt(x)) = -1
A.
3.5
B.
2.5
C.
-3.5
D.
-2.5
【简答题】By 2050 there will have been an extra 2.5 billion people on earth. And what will they eat? To solve the problem, we should have to double our food production. We can also develop a diet of algae（海藻）, ...
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