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【单选题】
空胶囊组成中的以下物质起什么作用：防腐剂（）A.
山梨醇
B.
二氧化钛
C.
琼脂
D.
明胶
E.
对羟基苯甲酸酯
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反馈参考答案：
举一反三
【单选题】He overwhelmed so many of his opponents alone. He’s really something.
A.
defeated
B.
overlooked
C.
overtook
D.
oppressed
【简答题】汽车空调所需的动力和驱动汽车的动力都来自同一发动机,这种空调系统叫( )。
【简答题】汽车空调所需的动力和驱动汽车的动力都来自同一发动机,这种空调系统叫( )。
【单选题】— Did you see Dr Ma yesterday afternoon? —When I got to his office, he ______. So we just talked little.
A.
left
B.
has left
C.
was leaving
D.
had left
【单选题】Robert Spring, a 19th century forger, was so good at his profession that he was able to make his living for 15 years by selling false signatures of famous Americans. Spring was born in England in 1813...
A.
southern money
B.
signatures of George Washington and Ben Franklin
C.
southern manuscripts and letters
D.
Civil War battle plans
【单选题】恩格尔系数用于衡量购买食品的支出占家庭收入的比重。随着经济的发展和人民收入水平的提高,恩格尔系数一般会( )。
A.
上升
B.
有时上升 有时下降
C.
不变
D.
下降
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