A few years ago, I took a sightseeing tr

蓝藻、绿藻和硅藻是湖泊中常见藻类。某课题组研究了不同pH对3种藻类的生长及光合作用的影响，实验结果见图1、图2。请回答下列问题：

(1)根据图1和图2分析，3种藻类中pH适应范围最广的是_________；在pH为8.0时，3种藻类中利用CO₂能力最强的是___________。

(2)在培养液中需加入缓冲剂以稳定pH，其原因是____________。

(3)在实验中需每天定时对藻细胞进行取样计数，请回答以下问题：

①．取出的样液中需立即加入固定液，其目的是________________。

②．在计数前通常需要将样液稀释，这是因为______________。

③．将样液稀释100倍，采用血球计数板(规格为1mm×1mm×0.1mm)计数，观察到的计数室细胞分布见图3，则培养液中藻细胞的密度是________个/mL。

患者，女性，38岁。因"不语不动、进食少25天，体重下降十千克余"来门诊求治。既往性格内向，不爱说话，做事认真固执。家族中无类似病史。

在患者木僵状态缓解后，能够进行有效交谈，此时精神状况检查应注意重点询问哪两个方面，以明确诊断（）

A.既往性格特征

B.平时应付方式

C.睡眠状况

D.发病至今的情绪状况

E.有无幻觉、妄想等精神症状

F.饮食情况

G.有无明显的心因

H.此前工作能力

I.药物依赖情况

On the morning of November 18, 1755, an earthquake shock Boston． John Winthrop, a professor at Harvard College, felt the quake and awoke. “I rose”, Winthrop wrote, “and lighted a candle, looked at my watch, and found it to be 15minutes after four.” John Winthrop hurried downstairs to the grandfather clock．It had stopped three minutes before, at 4:12．Except for stopping the clock, the quake had only thrown a key from the mantel（壁炉台）to the floor．

The clock had stopped because Winthrop had put some long glass tubes he was using for an experiment into the case for safekeeping． The quake had knocked the tubes over and blocked the pendulum（钟摆）．Winthrop, therefore, had the key on the floor． The quake had thrown it forward in the direction of the quake’s motion by a shock coming from the northwest, perhaps in Canada．

小题1:What does “it” in the second paragraph refer to?

A．the floor

B．the key

C．the clock

D．the case小题2:The text suggests that     ．

A．earthquakes are common in Boston

B．John Winthrop was a scientist

C．John Winthrop often had difficulty in sleeping

D．Harvard College was a center for earthquake researching小题3:Which of the following is true?          .

A．Some tubes were broken into pieces and stopped the old clock

B．The professor lit a candle because of power failure

C．Boston is in the southeast of Canada

D．The shocks were slight in one way小题4:John Winthrop put some tubes into this clock case because        ．

A．he wanted to do an experiment

B．he thought an earthquake was probably to happen soon

C．he thought it safe for them to be put there

D．he wanted to record the exam time of the earthquake．

A recent study suggests that teens’ relationship with parents, friends and teachers may have a lot to do with why they don’t get a good night’s sleep.

David Maume, a sociologist and sleep researcher, analyzed federal health data, which interviewed 974 teenagers when they were 12, and then again at 15. He found that family dynamics (动态) have much to do with how well kids sleep. Teens, who had warm relations with their parents and felt like they could talk to them or their parents were supportive of them, tended to sleep better. However, families that were going through a divorce or a remarriage tended to affect teens’ sleep.

And problems at school also affected teens’ sleep. Feeling safe at school and having good relations with teachers tended to promote better sleep. As did good relationships with friends. Kids who took part in sports or other positive social activities or shared similar academic goals with their friends were also more likely to get a good night’s sleep.

These add up to what makes lots of sense: a general feeling of well-being helps teens sleep. If we’re happy and contented, we’re much more likely to sleep better than if we’re sad and anxious.

Now, of course, teens can hardly resist being drawn to their computers and social networking. Maume also found that when parents were strict not only about bedtime, but also about limiting technology, kids slept better. It’s a finding that seems obvious, but parents really do matter when it comes to health habits of their teenagers.

Clearly, teenagers aren’t getting 9 to 10 hours a night, which puts them at risk for all the consequences of lack of sleep, including poor academic performance, colds and stress.

小题1:What is the passage mainly about?

A．Teens’ sleep is linked to their relationship with people around them.

B．Lack of adequate sleep puts teens at risk of many bad consequences.

C．Modern technology has something to do with teens’ sleep problems.

D．It is necessary for teens to join in sports and positive social activities.小题2:According to Maume’s analysis, who will probably have a poor night’s sleep?

A．Teens who feel like talking with their parents.

B．Teens who have friends sharing their dreams.

C．Teens who feel contented about themselves.

D．Teens who lack a sense of security at school.小题3: Para 5 functions as              .

A．a comparison

B．an introduction

C．a conclusion

D．an addition小题4: Parents are supposed to               when their kids are growing up.

A．continue their broken marriage

B．allow children to decide when to sleep

C．limit teens’ using new technology

D．force teens to have 10 hours’ sleep daily

塔机爬升过程中，禁止进行下列哪些动作？（）

A.起升

B.变幅

C.回转

D.起升和回转

E.起升和变幅