蓝氏贾弟鞭毛虫是通过含包囊体的粪便污染水源或食物而传播的。

阅读理解。

     We all maximize (扩大) the meaning of  "cool". You can use it instead of many words such as "new"

or "surprising". Here's an interesting story we can use to show the way the word is used. A teacher asked

her students to write about the waterfall (瀑布) they had visited. On one student's paper was Just the one

sentence, "It's so cool. Maybe he thought it was the best way to show what he saw and felt.

     But the story also shows a scarcity (缺乏) of words. Without "cool", some people have no words to

show the same meaning. So it is quite important to keep some credibility (可信性).

     Can you think of many other words that make your life as colourful as the word "cool"?  I can. And I

think they are also very cool.

1. We know that the word "cool" has had _____. [ ]

A. only one meaning

B. no meanings

C. many different meanings

D. the same meaning

2. In the passage, the word "express" means "_____". [ ]

A. see

B. show

C. know

D. feel

3. If you are _____ something, you may say, "It's cool." [ ]

A. interested in

B. angry about

C. afraid of

D. unhappy with

（选修模块3-5）

（1）关于光电效应现象，下列说法中正确的是______

A．在光电效应现象中，入射光的强度越大，光电子的最大初动能越大

B．在光电效应现象中，光电子的最大初动能与照射光的频率成正比

C．对于任何一种金属都存在一个“最大波长”，入射光的波长必须小于此波长，才能产生光电效应

D．对于某种金属，只要入射光的强度足够大，就会发生光电效应

（2）处于激发状态的原子，在入射光的电磁场的影响下，从高能态向低能态跃迁，两个状态之间的能量差以辐射光子的形式发射出去，这种辐射叫做受激辐射．原子发生受激辐射时，发出的光子频率、发射方向等，都跟入射光子完全一样，这样使光得到加强，这就是激光产生的机理．那么，发生受激辐射时，产生激光的原子的总能量E_n、电势能E_p、电子动能E_k的变化情况是______

A．E_p增大、E_k减小、E_n减小

B．E_p减小、E_k增大、E_n减小

C．E_p增大、E_k增大、E_n增大

D．E_p减小、E_k增大、E_n不变

（3）如图所示，质量为m的小球B连接着轻质弹簧，静止在光滑水平面上．质量为m的小球A以某一速度向右运动，与弹簧发生碰撞，当A、B两球距离最近时弹簧的弹性势能为E_P，则碰撞前A球的速度v₀大小为多少？

五个煤矿掘进工作面粉尘中游离二氧化硅含量测定结果分别为：煤矿甲 24%，煤矿乙22%，煤矿丙34%，煤矿丁39%，煤矿戊16%。在粉尘浓度相同的条件下，哪个煤矿掘进工作面粉尘引起尘肺的危害性最大

A．煤矿甲
B．煤矿乙
C．煤矿丙
D．煤矿丁
E．煤矿戊

上网定价发行与网下配售相结合的方式是指网下通过向机构投资者询价确定发行价格配售，同时网上对公众投资者定价发行。（ ）

对需要继续侦查而不能在法定期限内办结的犯罪嫌疑人被羁押的案件，对犯罪嫌疑人可以取保候审。( )