速读P50－51教材课文，完成下列任务：
Ⅰ.阅读判断
判断以下句子提供的信息是正确，还是错误，还是没有提及。
1．Every spring，millions of monarch butterflies begin a long and difficult journey. ( )
A．Right. B．Wrong. C．Not mentioned.
2．Until recently no one knew how monarch butterflies travel a long journey to the south and find their way to California or Mexico.
( )
A．Right. B．Wrong. C．Not mentioned.
3．The monarch uses its eyes to measure the position of the sun.
( )
A．Right. B．Wrong. C．Not mentioned.
4．Human activity is the only reason why the number of monarch butterflies is falling. ( )
A．Right. B．Wrong. C．Not mentioned.
5．People have been working together to record the monarch's migration and make sure that there are enough plants for it to feed on.
( )
A．Right. B．Wrong. C．Not mentioned.
[答案] 1－5 BAABA
