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【多选题】
How did chemiosmotic processes evolve in stages?A.
The first stage might have involved the evolution of an ATPase (pump) that pumped protons out of the cell using the energy of ATP hydrolysis. Such a proton pump could have been the ancestor of present-day ATP synthases.
B.
Stage 2 could have involved the evolution of a different proton pump, driven by an electron-transport chain. Indeed, some present-day bacteria that grow on formic acid use the small amount of redox energy derived from the transfer of electrons from formic acid to fumarate to pump H + .
C.
Stage 3 could then link these two systems together to generate an ATP synthase that uses the protons pumped by the electron-transport chain to synthesize ATP.
D.
An early cell with this final system would have had a large selective advantage over cells with neither of the systems or only one.
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【多选题】以下有关实验教学重要性的表述，正确的是（ ）。
A.
实验教学是传承知识的重要组成部分
B.
实验教学是实施主体性原则的前提和基础
C.
实验教学是创新教育的重要途径
D.
实验教学是教育创新的重要举措
【单选题】El texto aconseja como medida de seguridad :
A.
no utilizar ordenadores que no sean privados
B.
no tener direcciones parecidas
C.
buscar en Internet la dirección del banco
D.
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【简答题】已知不等式x 2 －2x＋k 2 －3>0对一切实数x恒成立，则实数k的取值范围是________．
【简答题】不等式|x-1|≥kx-2对一切实数x恒成立，则实数k的取值范围为______．
【单选题】This is a failure, but ____, it is a good lesson.
A.
of course
B.
by the way
C.
on the other hand
【简答题】已知不等式 对一切实数x恒成立，则实数k的取值范围是____.
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