24. What are black holes made of?
25. What happens to the objects around a black hole?
26. Is there proof that black holes really exist?
27. an explosion of huge stars
28. the tiniest particle
29. the same amount of mass
30. the existence of black holes
阅读判断
参考答案
16：MIT researchers carry out the study to illustrate an ancient Chinese proverb.
Wrong
17: Silk’s strength comes from its weak hydrogen bonds working together.
Right
18: Biologists and engineers are interested in understanding natural silks because they are very light and brittle.
Wrong
19: If the hydrogen bonds break due to external forces, they break fast.
Wrong
20: The MIT team had tried different materials before they studied natural silk in the research.
Not mentioned
21: Carbon nanotubes are currently the most popular topic in material science.
Right
22: It is indicated that materials stronger than natural silk can be expected in
Right