以下是引用atongmu在2003-9-29 17:30:00的发言: 38. the output of shrimps for many boat owners increased a lot, to the amount of a million tons, in the past several year, many shoppers have bought many shrimps from retailers at least50 million tons annually, but this year shoppers did not buy so many shrimps from retailers, the discrepancy exist because---------------. .
can it be"since this year the shrimps' quality couldn't meet with many shoppers' requirements
以下是引用atongmu在2003-9-29 17:30:00的发言: 39. the mosquitos of the united states infected the dengue fever will infect people when the persons are bited by them( similar to the cause of a dengue disease in guangzhou, china!), and when the rain is in abundance, mosquito will proliferate very fast, but this year the united states rained often, incidence rate was much lower than expected. why? because many infectors did not appear the symptoms temporarily.
i can't understand the explanation |