What should friends and foes know
A new generation of Americans are responsible for their government.
B. The United States is powerful.
C. The United States is governed by liberals.
D. The old generation of Americans are responsible for their government.
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典型的单元过程是各行业中具有典型特点的( )。
A. 基本过程或基本单元
B. 基本过程
C. 基本单元
D. 单元操作
--It's a long time () I saw you last.--Yes, and what a pity it is since it will be a long time()we see each other again.
A. before; since
B. when; when
C. since; before
D. when; then
What is a "diversified portfolio" of investments according to Mr. Boros
A wide selection of investments.
B. A limited range of growth stocks.
C. A group of low risk bonds and cash.
D. A lot of gains available in the investments.
名为scarlet gilia的植物花朵为红色或白色。人们一直认为白天觅食的蜂鸟为它的红花授粉，而夜间觅食的天蛾为它的白花授粉。为了证明这种以颜色决定的授粉方式的存在，科学家们最近将一部分scarlet gilia花只在白天遮住，而另一些scarlet gilia花只在夜晚遮住，结果开有红花在夜间被遮住的被授粉，而开有白花在白天被遮住的也被授粉。 下面哪项如果正确，将是证明蜂鸟被红花吸引而天蛾被白花吸引的又一证据
A. 未被遮住的scarlet gilia花，无论是红色的还是白色的，被授粉的比率大致相等。
B. 在8月底，当大部分蜂鸟迁徙而天蛾依然繁多时，开红花的scarlet gilia植物比该季节早些时候更频繁地结果。
C. 在夜间被遮住的白色scarlet gilia花授粉的频率大于未被遮住的白色的scarlet gilia花。
D. 白天被遮住的红色scarlet gilia花和夜间被遮住的白色scarlet gilia花仍旧未被授粉。
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