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问题 选择题

给果树嫁接时，要保证嫁接成功，其操作过程中  [ ]

A．必须使接穗和砧木的木质部紧密结合

B．必须使接穗和砧木的韧皮部紧密结合

C．必须使接穗和砧木的形成层紧密结合

D．必须将它们的树皮全部剥下来

答案

答案：C

填空题

短文填空。

     Mr. and Mrs. Green (1) h______ a big house. Their house (2) h______ a kitchen (厨房), four bedrooms

and three other rooms. There are some trees (3) n______ to their house.

     They (4) h______ two cars. One is for Mr. Green and the other is for Mrs. Green. They (5) h______ two

children. One is a (6) s______, and the other (另一个) is a (7) d______. The children like (8) s______ very

much. The son has five (9) b______, nine (10) s______ balls and many baseballs. He likes playing (11) b______

every day. The daughter has eight (12) v______ balls, ten ping-pang balls (13) a______ seven (14) t______

balls. She plays (15) t______ ball every day.

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单项选择题

关于房间隔缺损的杂音特点，以下哪项除外

A．位于胸骨左缘2～3肋间

B．杂音响度为2/6～3/6级

C．杂音为收缩期

D．杂音为喷射性

E．杂音粗糙伴震颤
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