Why save endangered species For the general public, endangered species appear to be little more than biological oddities. A very different perception is gained from considering the issue of extinction in a wider context. The important point is that many major social advances have been made on the basis of life forms whose worth would never have been perceived in advance. Consider the impact of rubber-producing plants on contemporary life and industry: approximately two-thirds of the world’s rubber supply comes from rubberproducing plants and is made into objects as diverse as rubber washers and rubber boots.
The author’s point is made chiefly by

A．acknowledging the validity of two opposing points of view.

B．appealing to the emotions of the audience rather than to their intellects.

C．suggesting a useful perspective for viewing the question raised at the beginning of the passage.

D．trying to discredit the view of an opponent without presenting an alternative hypothesis.

E．(E) generalizing from similar to dissimilar cases.

已知M₂O₃的相对分子质量为160，氧的相对原子质量为16，则M的相对原子质量是（　　）

A．56

B．72

C．112

D．144