单项选择题

What do we learn from the last paragraph

A．If we focus our attention on one thing, we might forget another.
B．Memory depends to a certain extent on the environment.
C．Repetition helps improve our memory.
D．If we keep forgetting things, we'd better rem to where we were.

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单项选择题

It can be inferred from the passage that______ .

A．new radio devices should be developed for tracking the endangered blue whales
B．blue whales are no longer endangered with the use of the new listening system
C．opinions differ as to whether civilian scientists should be allowed to use military technology
D．military technology has great potential in civilian use

单项选择题

A note in the pocket can hardly serve as a reminder because______ .

A．it will easily get lost
B．it's not clear enough for you to read
C．it's out of your sight
D．it might get mixed up with other things