| 如图表示一交流电的电流随时间而变化的图象，此交变电流的有效值是（ ） A．5 B．5A C．3.5 D．3.5A |
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| .完形填空。 Tom woke up on Monday morning. He felt 1 . He always felt sick on Monday mornings. He had to go to school for a 2 week! He almost wished there were no week-ends. 3 was even more difficult for him to go back to school! He 4 in bed and wondered what excuse (借口) he could make this time. He looked at his body, but could find 5 wrong, A little headache? 6 . He had used that excuse many times. Then he realized that one of his teeth was loose(松动). Good! He was just going to start groaning (呻吟) 7 be thought that Aunt Polly would pull the tooth out. That would 8 ! He looked for something else. Suddenly he remembered what the doctor had said about a certain problem with toes. He pulled his right foot out and looked at it. 9 of the toes was really hurting, Tom began to groan. "What's 10 with you?" Aunt Polly asked. "My toe hurts." The old lady fell into a chair, 11 a little. "Tom, you frightened me. Now shut upat once and gel out of 12 ." Tom felt like a thief being caught. "Well, it seemed all right. It hurt so much 13 I forgot my tooth." "Tooth, eh? What's wrong with your tooth?" "One of them is loose and it hurts 14 ." "No problem," answered Aunt Polly. "I can pull it out." "Please, Auntie! Don't pull it out. It has 15 hurting now. Please!" "No way! Well, you'll have your tooth out and you'll go to school? | ||||
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Dr Ma operated _______ over 150 patients _______ his visit to that poor town . [ ]
A. in, while
B. on, during
C. for, in
D. on, for
人的秃顶是由常染色体显性遗传因子B控制的，但只在男性可表现。一个非秃顶男性和一个其父非秃顶的女性结婚，他们生了一个男孩。该男孩后来表现为秃顶，其母亲的遗传因子组成是（）
A.BB
B.Bb
C.bb
D.BX
如果血型检查表明不符合遗传规律，则说明被鉴定人之间：（）
A、肯定是父子
B、可能是父子
C、不是父子
D、以上都有可能
2001年3月甲向乙借款5000元，约定2004年3月偿还，2002年3月乙向甲借款5000元，约定1年后偿还。2004年3月，甲向乙表示，各自债务都不用偿还了，乙表示同意，其后果是( )
A．合同变
B．合同无效
C．合同终止
D．合同转移