dependent, but under their laboratory conditions, the polymer chain lengths degraded to a quarter of their original length after 30 days of exposure.”

Lipinski and other scientists want no trace of the polymer to be left in the environment. He notes there is precedent for the biodegradation of small chains of iPPO which could effectively make it disappear and ongoing efforts aim to prove this.

32. What is special about the new polymer?

A. It can reduce plastic consumption.

B. It is expected to lower fishing costs.

C. It can degrade plastic waste in the sea water.

D. It has been developed to solve plastic pollution.

33. What can we infer from paragraph 3?

A. Fishing should be forbidden in the sea.

B. It requires great effort to invent the new plastic.

C. Nets and ropes are not the major pollution source.

D. Degradable plastics were not studied until recently.

34. What did the recent study find about iPPO?

A. Its original use.

B. Its special intensity.

C Its mechanical strength. D. Its complex composition.

35. What is Lipinski’s attitude towards the future of iPPO?

A. Hopeful.

B. Indifferent.

C. Skeptical.

D. Negative.

【答案】32. D 33. B 34. C 35. A

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