下列有关基因、染色体、性状的叙述中,不正确的是( )
A:DNA是遗传信息的携带者
B:生物体所有的性状表现都是由基因决定的
C:每条染色体通常只有一个DNA分子,一个DNA分子有多个基因
D:基因随生殖细胞代代相传
如图所示,要使流过灵敏电流计的电流反向,下列措施中可行的是 ( )
① 只将磁场反向② 只将线圈的运动方向反向③ 同时将磁场和线圈的运动方向反向④ 增加磁铁的磁性或线圈匝数
( A )
Report Card
Name: James Smith
Time: January 24th, 2015
Subjects
Grades
Comments(评语)
English
B+
Your reading and writing are good. But you have a strong accent(口音), so you are not good at speaking. And you do not put much effort into this subject. If you work hard, you can get a better grade in this subject.
Physics
A+
You are good at this subject. You are hardworking. I am glad that you do best in this subject.
Math
C
You like this subject. But you are not good at this subject because you are a little lazy. It is disappointing.You can do better if you try your best.
Music
B
It is a happy thing to hear you play the piano. You are crazy about music. Although you like this subject best, your accent has a bad influence on your singing.
阅读以上成绩单,根据表格内容完成以下问题
①船儿____ A.chuán er B.cuán er
②闪闪____ A.sǎn sǎn B.shǎn shǎn
③蓝天____ A.nán tiān B.lán tiān
④星星____ A.xīng xing B.xīn xin
⑤坐在____ A.zuò zài B.zòu zài
⑥两头____ A. liǎng tóu B.niǎng tóu