单选题
{{I}} Questions 11-14 are based on the following conversation. You now have 20 seconds to read the questions 11-14.{{/I}}
单选题
What are the speakers mainly discussing?
【正确答案】
B
【答案解析】 [听力原文]Questions <11>-<14> M: Did you know that
astronauts have made commercial products in space? W: No. I
wasn't aware of that. What kind of products? M: Tiny plastic
beads. W: Beads? Do you mean to tell me that astronauts have
nothing better to do than make jewelry beads in space? It seems to me that they
can make more useful things out there. M: Oh ! But these
plastic beads aren't for jewelry. They can be used for many scientific purposes,
from conducting cancer research to calibrating microscopes. W:
That sounds better. But why make such objects in space rather than on
earth? M: Because earth’s gravitational pull affects the beads.
The beads produces on earth are distorted not exactly round. The ones made in
space are precise spheres.
单选题
According to the conversation, what is the likely use for the beads?
【正确答案】
A
【答案解析】
单选题
According to the man, why did the astronauts made the beads in space?