________________________(在其他条件均等的情况下)，a man who Can express himself effectively will be more likely to succeed than one who cannot．

A．She doesn’’t remember much about the city.
B．She’’s never been to the city.
C．She would find someone else to help.
D．She would talk to the man later.

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