相关考题
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未知题型
Modem agriculture is criticized as unsustainable becauseA．it promotes the erosion of topsoil.B．it cannot provide a long-term planning.C．300 years is not long enough for the development.D．the lost topsoil is irreplaceable.
A.it
B.
B．it
C.
C．300
D.
D．the
E. -
未知题型
The U.S. Department of Agriculture played an important role in agricultural developments byA．adopting hybrid seeds and genetic engineering of plants.B．advocating the wide use of fertilizers and pesticides.C．improving the environmental conservation of lands.D．providing farmers with extension service of education.
A.S.
B.adopting
C.
B．advocating
D.
C．improving
E.
D．providing
F. -
未知题型
It is stated in Paragraph 1 that the theory of relativityA．is beyond all the current scientists' understanding.B．has failed Albert Einstein for years.C．seems at odds with the quantum mechanics.D．is useful in holding big things together.
A.is
B.
B．has
C.
C．seems
D.
D．is
E.
