—________your brother speak French?
—Yes, he has learnt it in Paris for three years.
A:Should
B:Must
C:Can
D:May
补全成语
①____声匿迹 ②物____天择 ③____然无存
④长途____涉 ⑤巧妙绝____ ⑥无动于____
一只蚊子在叮咬了甲后,又叮咬了乙.若甲的血液中含有丝虫病的幼虫﹣微丝蚴,乙被蚊子叮咬后也患上丝虫病.下列说法错误的是( )