题目：
交际运用。根据对话内容，在空白处填写适当的话语，使对话完整。
A: I'm ready to do some volunteer work for our city. I'd like to work outside.
B: You could help pick'up 1._______beside the streets.
A: I could do that! But what could my sister do? She wants to volunteer, but she 2._______like
to work outside.
B: 3._______?
A: She likes to play with children.
B: She could visit sick children at the hospital. She could play games with them.-,
A: 4._______!Now, how about my mom? What can she do?
B: Does she want to volunteer today?
A: Yes, she told me she'd like to help homeless people.
B: She could collect some clothes and put them in boxes. Or...she could 5._______ food at the
food bank.
A: I think she'd like to.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：A解析：RIA测定中，仪器探测到的放射性信号是仪器输出的电脉冲数，单位为每分钟计数（cpm），这是直接检测到的；但如果了解仪器的探测效率（η），还可计算核素的放射性衰变，则以每分钟衰变（dpm）或...
