牙髓温度测验：对照牙左上第二双尖牙冷测反应为刺激物接触牙面后即刻轻度疼痛。测验牙右上

指出加横线词语意思不同的两项（      ）（       ）（4分）

A．率妻子邑人来此绝境／陷入绝境

B．众妙毕备／群响毕绝

C．以土砾凸者为丘／此独以跛之故

D．欲穷其林／理屈词穷

依次填入下列各句横线处的词语，最恰当的一组是[ ]

①《天下天天谈》2010年5月6日报道：时代广场汽车炸弹案______美国民众，警方突审嫌犯。

②开发区位于城乡______部，新建的厂房十分吸引人的眼球。

③中国航天战略蓝图：2010年，实现登月，______建立包括永久性空间站在内的“地面一太空综合网”，而后将大型空间站发展成为空间航天基地。

A．震动 结合 既而

B．触动 接合 既而

C．震动 接合 继而

D．触动 结合 继而

More than 6000 children were expelled(开除) from US schools last year for bringing guns and bombs to school, the US Department of Education said on May 8.

The department gave a report on the expulsions as saying handguns accounted for 58 percent of the 6093 expulsions in 1996—1997, against 7 percent for rifles(步枪) or shotguns and 35 percent for other types of firearms.

"The report is a clear sign that our nation’s public schools are cracking down(严惩)on students who bring guns to school", Education Secretary Richard Riey said in a statement, "We need to be tough-minded(坚强的) about keeping guns out of our schools and do everything to keep our children safe. "

In March 1997, an 11-year-old boy and a 13-year-old using handguns and rifles shot dead four children and a teacher at a school in Jonesboro, Arkansas. In October, two were killed and seven wounded in a shooting at a Mississippian school. Two months later, a 14-year-old boy killed three high school students and wounded five in Daducab, Kentucky.

"Most of the expulsions(开除), 56 percent, were from high schools, which have students from about age 13, 34 percent were from junior high schools and 9 percent were from elementary schools. " The report said.

How many students were shot dead in 1997 in the US schools（）

A．10

B．9

C．12

D．22

写出下列反应的符号表达式，并注明反应类型：

（1）硫燃烧_______________；_______ ．

（2）加热高锰酸钾制取氧气______________；_______ ．

（3）双氧水制氧气_______________；_______ ．

（4）铁丝在氧气中燃烧______________；_________.

啮齿类动物易感寄生虫较多，而且啮齿类动物尤其是（）可以作为中间宿主，从而成为传播病原体的主要媒介。

A.大鼠

B.兔

C.小鼠

D.豚鼠