试述对于具有挥舞调节作用的旋翼桨叶，它的自然挥舞将使得旋翼锥体向哪个方向倾斜？

观察发现，甲地产的花生种子比乙地产的大．是什么原因导致两地花生种子的大小有差异？某科学兴趣小组进行探究：随机选取两地花生种子各100粒，在同一地点分别种植，收获后再分别随机选取两类花生种子各500粒，对其长轴进行测量，结果如图．其它地点试验结果相似．

（1）花生植株能通过______作用合成有机物．

（2）生物的变异可分成两类．分析以上实验结果可知，两地花生品种的长轴平均长度差异属于______的变异．

阅读短文，并按要求完成1—5题。

Failure is what often happens. It is everywhere in our life. Students may fail in exams, scientists may fail in their research work, and players may fail in competitions. Although failure happens to everyone, different people’s attitudes(态度) towards failure are different.

Some people don’t think that their failure is an important thing at all. So they pay no attention to it. As a result, they will have the (A)      failure later. Some people think they themselves are fools and lose their hearts in everything after they get a failure. Then they(B)      their time and energy on useless things. At last, they may really be fools as they have thought.

（C）Other people are quite different from these two kinds of people mentioned above. Instead of being hopeless and lost, they draw a lesson from every failure and become more experienced. They will be successful after hard work in the end. So we should draw a lesson from every failure and become more experienced.

1题为判断正误，2补全句子，3翻译成汉语，4为回答问题；5找主题句。

小题1:Failure happens to everyone. (    )

小题2:在( A )、(B)处的横线上分别填上一个单词（A）        （B）           

小题3:将(C)处句子译成汉语：

    _______      _____________      ______________________________.

小题4:Why do some people pay no attention to their failure?

                                    ________________________      .

小题5:请找出第三段的主题句，写在横线上__________________________________________.

病历摘要：患者，男，23岁，学生，由于“昏迷半小时”，由旅行社于11pm送来急诊。病史（同伴提供）：患者近几日来饮水较多，每日饮水约4000ml，但仍常诉口渴，而且喜冷饮。约每1小时需排尿一次（量不详），夜尿4-5次。食欲不佳，昏迷前一天曾有呕吐胃内容物2～3次，未见咖啡色样物，曾听患者诉“由于饮水太多，口淡，胃口不好，不如改喝可乐有味”。体查：T：38．6℃，R：16次／分，Ｐ：72次／分，BP130／80mmHg，昏迷，双瞳孔等大等圆，d＝2．5cm，对光反射存在，皮肤干燥，弹性差，中度脱水貌。呼吸较深大，有烂苹果味，双肺呼吸音清，未闻及干湿啰音。心界不大，HR：72次／分，各瓣膜区未闻及明显病理性杂音。生理反射存在，病理反射可疑。

目前主要诊断考虑什么疾病？提示：血常规：WBC：12．3×10⁹/L，NEUT：10．2×10⁹/L，Hb：156g/L，plt：140×10⁹/L；生化：Na：140mmol/L，K：4．5mmol/L，Glu：33．6mmol/L，CO₂CP：14mmol/L；尿常规：Glu（++++），Ket（+++），SG：1．021（）。

A.重症感染合并应激性高血糖

B.糖尿病酮症酸中毒

C.糖尿病非酮症高渗性昏迷

D.糖尿病乳酸性酸中毒

E.糖尿病合并重症感染

不符合孟德尔遗传定律的是（）

A.脊肌萎缩症

B.唐氏综合征（Down syndrome）

C.脆性X综合征

D.多发性硬化

E.结节性硬化

供用电合同订立的原则是什么？