单项选择题
The result of national__________ shows that the population has leveled off owing to the firm family control.
单项选择题 Scientists have made a __________ in their combat against the AIDS.
单项选择题 The most effective way to cope with the language problems while a foreign play is performed is __________ translation.
单项选择题 The __________ of temperature will make a difference in the sex of baby crocodiles.
