单项选择题
Questions 17—20 are based on the following passage about a sad mother. You now have 20 seconds to read Questions 17—20.
How did Jenny feel when she began her first speech
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A.Confident.
B.Guilty.
C.Ashamed.
D.Nervous and unsure of herself.
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单项选择题
What does NOT the speaker say about his father
A.He was a quiet and intelligent man.
B.He was 17 when he left Italy.
C.Dad worked hard selling.
D.He had much formal schooling.
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单项选择题
By saying they employ chemical warfare (Line 4, Para. 2), Bruce Ames means______.
A.plants produce certain chemicals to combat pests and diseases
B.plants absorb useful chemicals to promote their growth
C.farmers use man-made chemicals to dissolve the natural chemicals in plants
D.farmers use chemicals to protect plants against pests and diseases
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