第三部分阅读理解（共20小题；每小题2分，满分40分） 阅读下列短文，从每题所给

洋葱(2n=16)为二倍体植物。为比较不同处理方法对洋葱根尖细胞分裂指数(即视野内分裂期细胞数占细胞总数的百分比)的影响，某研究性学习小组进行了相关实验，实验步骤如下：

①将洋葱的老根去除，经水培生根后取出。

②将洋葱分组同时转入质量分数为0.01%、0.1%秋水仙素溶液中，分别培养24h、36h、48h；秋水仙素处理停止后再转入清水中分别培养0h、12h、24h、36h。

③剪取根尖，用Carnoy固定液(用3份无水乙醇、1份冰乙酸混匀)固定8h，然后将根尖浸泡在1mol/L盐酸溶液中5～8min。

④将根尖取出，放入盛有清水的培养皿中漂洗。

⑤用石炭酸一品红试剂染色。⑥制片、镜检；计数、拍照。

实验结果：不同方法处理后的细胞分裂指数(%)如下表。

请分析上述实验，回答有关问题：

(1)步骤③中“将根尖浸泡在1mol/L盐酸溶液中”的作用是______________。

(2)步骤⑥为了获得相应的观察视野，镜检时正确的操作方法是____________。

(3)根据所学知识推测，石碳酸-品红试剂是一种______性染料

(4)为了统计数据更加科学，计数时应采取的方法是_________。

(5)根据上表结果可以得出如下初步结论：

①．质量分数为__________秋水仙素溶液诱导后的细胞分裂指数较高；

②．本实验的各种处理中，提高细胞分裂指数的最佳方法是____________。

(6)下面为一位同学在步骤⑥所拍摄的显微照片，形成细胞a的最可能的原因是____________。

肺炎球菌肺炎患者病变发展，可闻及湿啰音的是（）

A.充血期

B.病变高峰期

C.红色肝变期

D.灰色肝变期

E.病变消散期

什么是“风气内动”？

When a disease of epidemic proportions threatens the public, scientists immediately get to work, trying to locate the source of affliction and find ways to combat. Vaccination is one of the effective ways to protect the (1) population of a region or country which may be (2) grave risk. The process of vaccination allows the patient’s body to (3) immunity to the virus or disease so that, if it is encountered, one can fight it (4) naturally. To accomplish this, a small weak or dead (5) of the disease is actually injected into the patient in a controlled environment, (6) his body’s immune system can learn to fight the invader (7) . Information (8) how to penetrate the disease’s defenses is (9) to all elements of the patient’s immune system in a process that occurs naturally, in which genetic information is passed from cell to cell. This makes sure that (10) the patient later come into contact with the real problem, his body is well equipped and trained to (11) with it, having already done so before.

There are, however, dangers (12) in the process. (13) , even the weakened version of the disease contained in the vaccine proves (14) much for the body to handle, resulting in the immune system (15) , and, therefore, the patient’s death. Such is the case of the smallpox vaccine, (16) to eradicate the smallpox epidemic that nearly (17) the whole Native American population and killed massive numbers of settlers. (18) 1 in 10,000 people who receive the vaccine (19) the smallpox disease from the vaccine itself and dies from it. Consequently, the process, which is truly a (20) , may indeed hide some hidden curses.

20（）

A.luck

B.triumph

C.blessing

D.promise

管路系统的特性曲线是随着（）的增加而上升。

A、流量

B、扬程

C、轴功率

D、效率