题目内容
(请给出正确答案)
[主观题]
One of the requirements for producing vapor is that the water ______ to its boiling point.
A.must be heated
B.has to be heated
C.is to be heated
D.be heated
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A.must be heated
B.has to be heated
C.is to be heated
D.be heated
第1题
A.raw
B.crude
C.rough
D.primitive
第2题
A.factors
B.portions
C.sources
D.elements
第3题
A.form
B.shape
C.cultivate
D.present
第4题
A.get
B.got
C.getting
D.to get
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