放灰时，除灰设备的排灰沟附近应无人（）或（）。

     Jack London was a famous American writer. He was born on January 12, 1876,in San Francisco,

California. His family was very poor, and Jack had to leave school to make money. He worked hard in

many different jobs.     

     Later, Jack returned to school, but he didn't stay. He wrote, "Life and pocketbook (袖珍书) were both

too short."

     In 1897, he went to Alaska to find gold. Instead, he found ideas there for his books and stories. He

returned home and started to write. His writing were successful (成功的), and he became rich and famous

in his twenties.  

     Jack London was not a happy man, however. In poor health, he took his own life in 1916. He was

only 40 years old.

1.Jack London was _____. [ ]

A. a musician

B. a writer

C. a basketball player

D. a teacher

2.He went to Alaska _____. [ ]

A. for holidays

B. because his wife lived there

C. to find gold

D. to meet his parents

3.Jack London became rich and famous _____.[ ]

A. when he was thirty

B. when he was over twenty

C. in his thirties

D. when he was a child

14.Which of the following sentences is true?  [ ]

A. Jack died in Alaska.

B. Jack was born in London.

C. Jack found gold in Alaska.

D. Jack was a successful writer, but he didn't live happily.

5.Which of the following sentences is not true?[ ]

A. Jack didn't find gold in Alaska, instead he found ideas for writing.

B. Jack didn't like to go to school.

C. Jack died in 1916.

D. Jack had only a little education (教育) when he was young.

同学们用实验探究通过定值电阻R的电流随加在该定值电阻两端的电压变化的规律。

（1）其中一个实验小组的同学所用的实验电路图甲所示。

     ①在某次测量时电压表的示数如图乙所示，此时电压表的示数为_______V。 

     ②通过实验得到了如表一所示的数据，由此可归纳出的探究结论是___________________________。

（2）另一实验小组的同学在做此实验时，使用的实验器材与上一实验小组的相同且均完好，每次读数也准确。他们将测量的数据记录在表二中，分析表二和表一的数据发现，记录的电压表示数不同，造成两表格中电压数据不同的原因可能是本组实验中__________________________________。

忘记昨天，也不要痴想明天，明天是一个未知数，为什么要把今天的精力浪费在未知的事上想着明天的种种，今天的时光也白白流失了。祈盼今早的太阳再次升起，太阳已经落山。走在今天的路上，能做明天的事吗我能把明天的金币放进今天的钱袋吗明日瓜熟，今日能蒂落吗明天的死亡能将今天的欢乐蒙上阴影吗我能杞人忧天吗明天和昨天一样被我埋葬，我不再想它。 以下各项最能概括本段文字的是( )。

A．要把未来的事和过去的事通通忘掉，因为想它们都没有什么意义

B．不要痴想明天，因为未来的事今天无法做到，去痴想只是浪费时间和精力

C．如果保留在对明天的幻想，我们将不会再有欢乐，时间也会白白流逝

D．我不会去想明天的事，我要将记忆和理想全部排斥

汉族的服饰“黄帝垂衣裳而天下治”，始终保留的鲜明特点，其服装在式样上是（）。

A.大襟右衽

B.大襟左衽

C.曲裾禅衣

D.直裾禅衣