单项选择题

(The farmer) knows something that the whole (civilized) mankind seems (to have forgotten), namely, (when) the resources of life on our planet are not inexhaustible.

A．The farmer
B．civilized
C．to have forgotten
D．when
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单项选择题
T. he world's (remained) tropical forests (are being destroyed) so fast that, (at) current trends, by the middle of this century only (the most inaccessible) will remain.
A．remained
B．are being destroyed
C．at
D．the most inaccessible
单项选择题
The clever method (was) (paid attention) by very few technicians (until) (the) early 1970s.
A．was
B．paid attention
C．until
D．the
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