TPO6 Powering the industrial revolution - 英檢

The source had long been known but not exploited. Early in the century, a
pump had come into use in which expanding steam raised a piston in a
cylinder, and atmospheric pressure brought it down again when the steam
condensed inside the cylinder to form a vacuum．This "atmospheric engine,”
invented by Thomas Savery and vastly improved by his partner Thomas
Newcomen, embodied revolutionary principles, but it was so slow and wasteful
of fuel that it could not be employed outside the coal mines for which it had
been designed. In the 1760s, James Watt perfected a separate condenser for
the steam, so that the cylinder did not have to be cooled at every stroke;
then he devised a way to make the piston turn a wheel and thus convert
reciprocating (back and forth) motion into rotary motion. He thereby
transformed an inefficient pump of limited use into a steam engine of a
thousand uses. The final step came when steam was introduced into the
cylinder to drive the piston backward as well as forward thereby increasing
the speed of the engine and cutting its fuel consumption.

6.
According to paragraph 2, Watt's steam engine differed from earlier
steam engines, in each of the following ways, except:

1.It used steam to move a piston in a cylinder.
2.It worked with greater speed.
3.It was more efficient in its use of fuel.
4.It could be used in many different ways.

答案是1 但是我找不到在文中哪裡有明確的點
我選只是因為另外三點都有提到
是我有漏掉什麼嗎
我覺得唯一有關連的只有James Watt perfected a separate condenser for
the steam, so that the cylinder did not have to be cooled at every stroke

但是condenser跟piston在文中並不有說是相等的 所以我覺得好怪一一a

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