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【单选题】
学习通签到功能不顺畅,改为作业签到。 你到了吗? 第一章的视频学习完成了吗? 今天按时完成第二章的视频学习好吗?A.
老师，我到了。 第一的视频学习已完成。 好的，今天会按时完第二章的视频学习。
B.
老师，我到了。 第一的未完成，我会抓紧时间完成。 好的，今天会按时完第二章的视频学习。
C.
C
D.
D
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【单选题】Why did the author stop giving speeches for a while?
A.
The death of his stepbrother makes him feel guilty.
B.
The development of seat belt avoided most accidents.
C.
There are no more requests from schools inviting him.
D.
He did not have enough time to give lectures at that time.
【单选题】Why did the author's aunt try to teachher children to speak Korean?
A.
To help her improve herKorean language skills．
B.
To help them establish aKorean identity．
C.
To help them succeed inthe U．S．
D.
To help them find a goodjob．
【单选题】Why did the author visit Australia?
A.
to study Australian farming methods
B.
to investigate how the fence was constructed
C.
because he was interested in life around the fence
D.
because he wanted to learn more about the wool industry
【简答题】根据DNA分子结构模式图回答下列问题：【图片】（1）写出名称：① ② ③ ④_____________；⑤_____________；⑥_____________；（2）分析这种结构的主要特点：①DNA分子的基本骨架由_____________交替连接而成。②DNA分子两条链上的碱基通过_____________连接成碱基对。碱基之间的一一对应关系叫③D...
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