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【单选题】
城市民用天然气的主要成分是( )。A.
甲烷
B.
—氧化碳
C.
硫化氢
D.
乙烷
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【单选题】There are a lot of signs men are more likely to have heart attacks than women.
A.
indicate
B.
to indicate
C.
indicated
D.
indicating
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【单选题】Why does the professor say this:
A.
To emphasize the point that he has just made
B.
To indicate that another point will be made
C.
To demonstrate that the point is his opinion
D.
To regain the students' attention for the next point
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