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--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

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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.

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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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应急演练的参与人员不包括( )。

A. 参演人员
B. 控制人员
C. 模拟人员
D. 策划人员

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President Kennedy has promised God and ______ that he will continue to renew the United States.

A. Congress
B. the American people
C. Jacqueline
D. people of the world

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--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

应急演练的参与人员不包括( )。

President Kennedy has promised God and ______ that he will continue to renew the United States.

A. before; since
B. when; when
C. since; before
D. when; then