表达式'abc10'.isdigit()的值为True。
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表达式'aaasdf'.strip('a')的值为 ' ' 。
What was the author's primary purpose for writing this text?
A. to entertain us with the story of Dan and Steve
B. to persuade us that genetic testing is best
C. to inform us about how our genes caninfluence our lives
Why did the author start this text with a story?
A. to tell the reader about her friends Steve and Dan
B. to get our attention
C. to make us feel sorry for Dan
The writer's move from the narrative about Dan and Steve to a more informative text takes place in which paragraph? How do you know?
A. 2
B. 3
C. 4