问题
单项选择题 A1型题
彗星试验检测的遗传学终点是（）
A.DNA完整性改变
B.DNA交换或重排
C.DNA碱基序列改变
D.染色体完整性改变
E.染色体分离改变
答案
参考答案：A
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彗星试验检测的遗传学终点是（）
A.DNA完整性改变
B.DNA交换或重排
C.DNA碱基序列改变
D.染色体完整性改变
E.染色体分离改变
参考答案：A
完形填空（本题有10 小题，每小题1分，共10分） 先通读短文，掌握其大意，然后从A、B、C、D四个选项中选出一个可以填入相应空白处的最佳答案。 Sally is 96 years old. She has no sons or daughters. Her husband 1 fifteen years ago. But she didn’t move into a nursing home. She would like to 2 herself every day. Every night she spends two hours 3 kids with their math for twenty years. All kids living on her street can get her help without payment（付费）. She was a famous 4 before she retired from a middle school. She gets up early in the morning, then does sports, goes shopping or helps cleaners 5 the street. And she does these happily. When the kids come for help, she is always 6 and tries her best to help them. People asked her 7__ . She said, “ I love it, it makes me happy to help them.” She is always happy every day and always says hello to people around her 8 a smile. “I’ve decided to love everything around me. So I’m happy to do 9 . I’m thankful for those kids who come to me for help. Each kid is a 10 for me. I love each day to help them.” She said. Really, a good decision decides what a person does in life.
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