A heat pump is used to make the room comfortable by using_____（）
A. electric resistance
B. natural heat and cool
C. coal energy
D. petrol energy
查看答案
Choose the appropriate meaning for the word “inflection” used in line 4 of paragraph 2（）
A. Changes in the forms of words
B. Changes in sentence structures
Changes in spelling rules
D. Words that have similar meanings
According to the passage, we can make the substance cool quickly by _____（）
A. blowing cold air over it
B. putting it in the room
C. covering it with something
D. blowing hot air over it
According to the passage, a heat pump is _____（）
A. only used at night
B. only used in summer
C. only used in winter
D. used in summer and in winter as well
Which one is not a strong claim（）
A strong claim is not a fact
B. A strong claim is engaging or something new
C. A strong claim is a relatively abstract sentence
D. A strong claim states the actual conditions of the event
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