单项选择题

The main idea of the first paragraph is______.

A．The advantages in using bio-weapon
B．The trend of nuclear weapon development
C．A variety of weapons invented by man
D．The history of nuclear weapon development

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热门试题

单项选择题

Women screenwriters are more likely to write about______。

A．thrillers (恐怖故事)
B．women stories
C．legal stories
D．sci-fi stories

单项选择题

The phrase radiation so strong it cracks glass (line 4, paragraph 2) means______.

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