多项选择题

If you had________ (听从了我的忠告，你就不会陷入麻烦).
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单项选择题
A．Jimmy is going to set out tonight.B．Jimmy has not decided on his journey.C．There is no need to have a farewell dinner.D．They may have a dinner when Jimmy’’s back.
A．Jimmy is going to set out tonight.
B．Jimmy has not decided on his journey.
C．There is no need to have a farewell dinner.
D．They may have a dinner when Jimmy’’s back.
单项选择题
The primary purpose of the passage is to discuss ______.
A．the difficulties of applying technological solutions to the problem of food shortages
B．the means of assessing the extent of the world food shortage
C．the costs of introducing a new food technology into a developing country
D．the nature of the new technological innovations in the area of food production
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