A.Right
B.Wrong
C.Not mentioned
19、 If the hydrogen bonds break due to external forces, they break fast.
A.Right
B.Wrong
C.Not mentioned
20、 The MIT team had tried different materials before they studied natural silk in their research,
A.Right
B.Wrong
C.Not mentioned
21、 Carbon nanotubes are currently the most popular topic in material science.
A.Right
B.Wrong
C.Not mentioned
22、It is indicated that materials stronger than natural silk can be expected in the future.
A.Right
B.Wrong
C.Not mentioned
下面的短文后有2项测试任务:(1)第2326题要求从所给的6个选项中为指定段落每段选择1个标题;(2)第27-30题要求从所给的6个选项中为每个句子确定一个最佳选项。
23、根据材料,回答23-31问题。
Black Holes 1. Black holes can be best described as a sort of vacuum, sucking up everything in space.Scientists have discovered that black holes come from an explosion of huge stars. Stars thatare near death can no longer burn due to loss of fuel, and because its temperature can nolonger control the gravitational ( 重力的) force, hydrogen ends up putting pressure onto thestars surface until it suddenly explodes then collapses.
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