单项选择题

胶合木构件的木板接长一般应采用下列哪一种？（　　）

A.单齿或双齿连接
B.螺栓连接
C.指接连接
D.钉连接
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单项选择题
根据下面资料，回答21-35题Sometimes I feel that being the mother of three small children is like operating a large circus(马戏团)．21afternoon last week, my three sons playing peacefully in the back yard ( 院子),22the ball from one to another．I jumped at the chance to talk to one of my friends23the phone, but before I24to the phone, I could tell the boys had begun to quarrel with each other about something．I rushed out to25peace,but before I got there Charles had26a rock at Mark,and hit him in the eye．By the time I got to the back yard,they had begun to27about this．Even David,the oldest boy,who won' t usually fight with anybody about28,was involved(卷入) First,!29them stop fighting, and then ! examined Mark' s eye．I decided that it wasn' t going to develop into a black eye, but I felt that they should30at least a little for31they had done． I' m going to32to your father about this when he comes home tonight, I said． He and I will think of how to punish you． Things were33quiet after that for about half an hour, and then Charles34a glass in the kitchen,and at almost the same35,Mark fell out of the apple tree．第（23）题答案
A.through
B.in
C.on
D.by
单项选择题
A.见图AB.见图BC.见图CD.见图D
A.见图A
B.见图B
C.见图C
D.见图D
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