请教几道语法题，谢谢！

WeiZhenUID: 2101725

mankind
human being
human beings的区别是什么？
是单数还是复数。谢谢！做主语时谓语动词用什么形式。Human beings has ...对吗？

[ Last edited by WeiZhen on 2005-12-16 at 18:13 ]

WeiZhenUID: 2101725

Thanks!

WeiZhenUID: 2101725

18．6．The first inhabitants of the territories_____ Canada came across the Bering Strait and along      
the edge of the Arctic ice.
A make up that now
B make up now that
C that make up now
D that now make up
D
18.8.The most important chemical catalyst on this planet is chlorophyll, ______________carbon dioxide and water react to form carbohydrates.
A whose presence
B which is present
C presenting
D in the presence of which
D
17.19 (In) plane geometry, the sum of ( the internal) angles of (any) triangle (has)  always  equal
to 180 degrees.
D
16.4.Stars shine because of _____produced by the nuclear reactions taking place within then.
A the amount of light and heat is
B which the amount of light and heat
C the amount of light and heat that it is
D the amount of light and heat
D
16.15An image on a national flag can symbolize political ideas that_____ express.
A take many words to otherwise would
B would take t many otherwise words
C many words to take would otherwise
D would otherwise take many words to
D
16.30Alaska became the forty-ninth state ( in) 1959,(and) Hawaii became the (fiftieth) state (lately) that year
D.
15.18Materials (that of) clay are (among ) the most ancient (manufactured articles) and have played a vital role (in) human civilization.
A
15.39Mercury is (so much) close to the Sun (that it is )usually (invisible) in the (glare)  of  the
Sun’s rays.
A

WeiZhenUID: 2101725

帮忙看一下，谢谢了！

WeiZhenUID: 2101725

帮忙看一下，谢谢了！