According to the passage, Vienna was once a center of ______.
A. traffic
B. trade and science
C. art and music
D. and
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下列物质常用于防腐剂的是
A. 甘油
B. 吐温80
C. 丙二醇
D. 单糖浆
E. 苯甲酸
I have ______ gone over my lessons, but he hasn't ______.
A. already,already
B. already,yet
C. yet,already
D. yet,yet
According to this passage, fires in Indonesia ______.
A. will not end until it starts to rain
B. will be eventually put out by human efforts
C. will die out in a few days when the trade winds blow
D. can only stop when the peat is totally wet
We can infer from the passage that ______.
A. the English always fought against the Indians because of land
B. the French always fought against the Indians for land
C. the English didn't fight against the Indians for land
D. the Indians gave up their land to English
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