更多"The problem of environment protecti"的相关试题:
[单项选择]One problem that has not yet been solved, it seems, is that ______.
A. a prototype has not yet been accepted
B. financial backing is not available
C. the machine will need fire-resistant sensors
D. the machine would not work if the ventilation was overwhelmed
[单项选择]The problem has been ______ my mind all day.
A. preying on
B. getting at
C. taking on
D. seeing to
[单项选择]A problem that has plagued some fictional Utopias is ______.
A. creation of super-apes
B. the necessity of breeding super-humans
C. the necessity of breeding subhumans
D. the degradation of beasts
[单项选择]______ has been the major problem in the Great Lakes in recent years.
A. Too many algae
B. Excessive recreational use
C. Lack of adequate rainfall
D. Too much evaporation
[单项选择]Recently, great advances have been made in the study of Mars' surface by the use of radar waves to ______ the dense cloud layer.
A. hover
B. pierce
C. penetrate
D. plunge
[单项选择]First of all, this difficult problem has to be tackled, thus ______ us to proceed to the others.
A. to enable
B. enabled
C. enabling
D. having enabled
[单项选择]What has caused the pollution problem
A. Careless methods of production.
B. Lack of consumer demand for environment friendly products.
C. Millions of tons of glass, paper, plastic and metal containers are produced.
D. Both[A]
