什么叫空白试验？

1986年首届国际健康促进大会通过了

A．雅加达宣言

B．曼谷宣言

C．宋斯瓦尔宣言

D．渥太华宣言

E．阿特莱德宣言

完成句子

1 ．The goods will be well packed after ________________( 认真检查) ,and sent to the named port

for sailing.(inspect)

2 ．As we drew closer ,I could see a whale ________________( 遭受攻击)by a pack of about six

other killers.(attack)

3 ．No one has come up with a convincing explanation of ________________( 恐龙为什么灭绝了) ．(die)

4 ．Mr.Johnson insisted that the problem worthy of attention ________________( 讨论) at the meeting.(discuss)

5 ．As ________________( 空气正在受到污染) ,many kinds of wild animals are dying out.(pollute)

6 ．________________( 正如报告里所说) ,the new machine will work twice as fast ,thus reducing

costs.(put)

7 ．Had I known about this computer program ,a huge amount of time and energy ________________( 省下了) ．(save)

8 ．It is for the first time in my life ________________( 我认识到了) the importance the government

has attached to the environmental protection.(appreciate)

9 ．At present ,lots of food ,water ,tents ,and medicine ________________( 正在运往)from all over

China and other parts of the world to the earthquake －stricken areas.(transport)

10 ．So difficult ________________( 我感到) it to live in an English －speaking country that I

determined to learn English well.(feel)

慢性毒性试验的试验周期是（）

A.6个月

B.9个月

C.12个月

D.1～2年

E.2～3年

安装起重机时，起重臂滑落，周某从25m高处坠落死亡，根据《企业职工伤亡事故分类标准》（GB6441-86），这是一起高处坠落事故。