The main idea of the first paragraph is______. The phrase "radiation so strong it cracks glass"(paragraph 2) means______.

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问题 The main idea of the first paragraph is______.
The phrase "radiation so strong it cracks glass"(paragraph 2) means______.

选项 A、glass is too strong to be destroyed
B、radiation can cause glass to be broken
C、radiation is not strong enough to break glass
D、bacterium can break glass easily

答案B

解析 词义理解题。这个短语的意思为“射线如此强大以至于它可以使玻璃粉碎。”选项B与短语的意思相吻合。
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