19 Some of the trials were probably stopped early for commercial reasons.
A Right
B Wrong
C Not mentioned
42 WhichstatementabouttheepidemicisNOTtrue?
A Itoccurseveryfourthyear.
B ItstartsonMarch15.
C Itisknownas"MarchMadness".
D ItlaststhroughthebeginningofApril.
(2009年真题)关于各类规划的编制和期限,下列说法正确的是()。