多项选择题

电主要由发电机产生。世界上发电方式主要是（）三种。
A、火力发电
B、水力发电
C、核电
D、太阳能
E、地热能

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标准摩尔反应焓变⊿rHmθ为生成物的标准摩尔生成焓（或者燃烧焓）之和减去反应物的标准摩尔生成焓（或者燃烧焓）之和。

答案：错误

单项选择题

When we say that the first paragraph foreshadows the body of the short story, we mean that it_____.
A、prepares the reader for the later event
B、casts a dark shadow over the story
C、shapes the structure of the story development
D、gives a signal that something great is to occur