看涨期权的持有者交纳保证金,看跌期权的出售者交纳保证金。
A.需要;不需要
B.需要;需要
C.不需要;需要
D.不需要;不需要
参考答案:C
根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
When some plates of the earth move suddenly, an earthquake happens. __61__ Earthquakes may happen anywhere on the earth. They often happen near mountains.
During an earthquake, the shakings make rocks rise suddenly and even crakes(裂缝)open. __62__ And sometimes whole villages or cities are destroyed.
__63__ Scientists have studied earthquakes and made maps that show the “earthquake belt”__64__ In these areas we can build strong houses to fight against earthquakes.
__65__ They can also tell people what to do and how to do it.
关于多形红斑,以下不正确的是()
A.发病突然,无前驱症状
B.好发于儿童和青年
C.春秋季多见
D.好发于四肢远端和面部
E.有自限性倾向