填空题

Scientists think that we should blame the virus of flu all on wild birds.

【参考答案】

N

<上一题目录下一题>

热门试题

填空题

The virus of flu is well adapted to immune systems of water birds, and does not usually make them very sick.

问答题

表明你写这封信的目的。 2．选择这份工作的原因。