【正确答案】 C

【答案解析】[听力原文]
M: Hi, Alice. It"s Jim speaking.
W: Hi, Jim. What"s up?
M: I"m calling about the machines. Have you installed them?
W: Yes. We finished installing them last week.
M: When will you start testing the machines?
W: Next Monday.
M: How long will it take?
W: About three weeks.
M: Good! Keep us informed.
W: We will. Bye!

When did they finish installing the machines?

[解析] 本题询问他们什么时候安装完了这些机器。“install”意为“安装”，根据女士回答“We finished installing them last week.”可知答案为C。

【正确答案】 B

【答案解析】[听力原文]
What are they going to do?

[解析] 本题询问他们下一步打算做什么。“be going to do”结构表示近期的打算。听录音时，注意时态will和关键词test，就能找出正确答案。因此答案为B。