读图，回答：该河段洪涝灾害多发的主要原因是( )①上游支流多，呈扇形水系②流量季节变化大③河道弯曲，水流不畅④人们砍伐森林，围湖造田

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读图，回答：该河段洪涝灾害多发的主要原因是( )

①上游支流多，呈扇形水系②流量季节变化大③河道弯曲，水流不畅④人们砍伐森林，围湖造田

A：①③

B：②③

C：③④

D：②④

上一题下一题 0.0难度选择题更新时间:2017-11-25 01:55:08

C

Manners in a dinner party
What to take	You can bring some drinks like ____ juice, beer or something like these.
When to arrive	You should arrive on time or no more than ____minutes late. If you'll be fifteen late, you should give the host a ____.
What to do at the table	Try to be relaxed and ____ at the table. If you can't use the knife and ____ , you can watch others.