The local government spares no efforts to ___ (促进) eco-tourism.
A. progress
B. boost
C. develop
D. propel
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The shortage of fuels ___ (导致) the need for an economical engine.
A. generates
B. incurs
C. results in
D. gives rise to
Recent research ___ (证明) that Jackson’s theory of economic development is flawed.
A. tested
B. certified
C. demonstrated
D. confirmed
The writer of the article ___ (阐明) his opinion very clearly and reasonably.
A. exposed
B. clarified
C. illustrated
D. expounded
There are several ways to avoid the probability of serious pest attacks, or at least ___(降低) their impact.
A. diminish
B. lessen
C. relieve
D. degrade