Passage 4: Questions 33-37 Disposing of waste has huge environmental impacts and can cause serious problems. In many
countries around the world, much is buried in landfill sites. Some waste will eventually rot, but not all, and
in the process it may smell, or generate methane gas, which is explosive and __(33)__ the greenhouse
effect. Leachate__ (34)__ as waste decomposes may cause pollution. Badly-managed landfill sites
may attract vermin or cause litter.
A priority is to move from reliance on waste dumps that offer no environmental protection, to waste
management systems that__ (35)__ useful resources within the economy. Waste __(36)__ at source
and use of specialized waste processing facilities to separate recyclable materials has a key role. Disposal
of residual waste after extraction of material resources __(37)__ engineered landfill sites and/or
investment in waste-to-energy facilities.
【題組】33.
(A) hinges on
(B) wears out
(C) looks into
(D) contributes to