混合性发绀
A．急性心肌梗死B．感染性心内膜炎C．急性左心功能不全D．甲状腺功能亢进症E．高度房室传导阻滞下列症状最常见于何种疾病
参考答案：C
读小短文，然后做题。
There are many books on the shelves in my home. Some are my father's, and some are my mother's. And
some are mine. We all like books very much. We learn a lot from books. They tell us what is good and what is
bad. Sometimes I give some books to my classmates. They like to read them, too. We often say, " Books are
our good friends."
1. What're on the shelves? There are _____________ books.
2. Who do you sometimes give the books to? Sometimes I give books to my _____________.
3. Do your classmates like to read them? Yes, _____________ _____________.
4. What do we often say? We often say, " _____________ are our good _____________."
5. Whose books are they? They are _______________.
A. my father's
B. my mother's
C. mine
D. A, B and C
6. We can learn something new from _______________.
A. the books
B. my mother
C. my father
铜管加工时，不得采用（）方法进行切割和坡口。
A.锉刀
B.手工钢锯
C.车床
D.氧乙炔焰
