The phrase "harped on" in "who harped so often on independence" in the fourth paragraph means _____.
A. thought about.
B. talked about.
C. worried about.
D. troubled about.
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A suitable title for the passage would be ______.
A. The Significance of Salem's Witch Trials.
B. European Settlers and American Indians.
C. The Reflection on the Details of .Salem's Witch Trials.
D. Campaigning on the Indian Frontier.
属于甲型强心苷元的是( )
A. 羟基洋地黄毒苷元
B. 绿海葱苷
C. 紫花洋地黄苷A
D. 真地吉他林
E. 绿海葱苷
When the book reviewer talks about the book,______.
A. he is in favor of it.
B. he is slightly critical of it.
C. he is strongly critical of it.
D. he is indifferent to it.
既能驱虫，又能清热解毒、凉血止血的药物是( )
A. 贯众
B. 苦楝皮
C. 槟榔
D. 雷
E. 川楝子
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