单项选择题

从标志的内容上看，安全标志有四大类，禁止标志、警告标志、提示标志、指令标志。

A.正确
B.错误

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未分类题

From Sociologist Harriet Zuckerman's book we learn that ______.A.the age lore worked for physicistB.in certain science Nobel prizes not only belonged to young scientistsC.scientists over 30 were as good as deadD.researchers flourished when they past 60

A.A.the
B.in
C.scientists
D.researchers

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We can learn from the passage that the hamburger described as a quarter of a pound is______a quarter of pound after being cookeD.A.heavier thanB.reallyC.lighter thanD.slightly heavier than

A.A.heavier
B.really
C.lighter
C.slightly

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