典型动静脉畸形的组成是（） A.动脉和静脉组成 B.供血动脉、畸_爱下问搜题

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问题单项选择题 A1型题

典型动静脉畸形的组成是（）

A.动脉和静脉组成

B.供血动脉、畸形血管团和引流静脉组成

C.由供血动脉、毛细血管和引流静脉组成

D.由畸形血管团组成

E.由静脉动脉化形成

答案

参考答案：B

解析：典型动静脉畸形由供血动脉、畸形血管团和引流静脉组成。

填空题

用方框中所给单词的适当形式填空，使短文完整正确。（每个单词限用一次）

invite different work in popular do sport weekend or together

    American people go to work five days a week. They usually have a two-day l            whieh is Saturday and Sunday. On weekends, people spend their time ___2_____all kinds of things and they do them ill  3    ways. Many f'amilies
enjoy their weekends 4____.They may go shopping, go for a walk，visit
friends,5      go to church. They may also  6__________friends over and have a party at home.
    Many American families d0 7    0n weekends. Running, biking and
swimming are 8     during summer, while skiing and skating are very common 9    winter.
    The weekend is also a time for American families t0 10____  in their
gardens. For them, weekends are very busy.

问答题简答题

安全标志有哪些，如何表示，分别举2例？