问题 单项选择题

根据国家的有关规定,一般死亡事故从死亡人数上看是指()。

A.3人以下

B.3人以上10人以下

C.10人以上30人以下

D.30人以上

答案

参考答案:A

阅读理解

阅读理解。

    Three rich ladies met every day by the river. They sat there and talked the whole day. Once the three

ladies quarreled. One of them said, "Look, how white and beautiful my hands are!" Another one said, "My

hands are more beautiful." The third one said, "Mine are the most beautiful ones." An old beggar woman

came to them. "Beautiful ladies," she said, "I'm old and can't work. I'm hungry. Please give me something

to eat."

     But the three women gave her nothing. They only asked, "Tell me, old woman, who of us has the most

beautiful hands?"

     A peasant woman (农妇) was also sitting by the river. She was poor and her hands were rough because

of hard work. The old woman came up to her and said, "I'm hungry. Please give me something to eat." The

peasant woman took out her only cake she had and gave her half.

     The old woman ate it and drank some water. Then she took the peasant woman by the hand, brought her

before the rich ladies and said, "Now, I shall tell you whose hands are the most beautiful. The hands of the

poor peasant woman are rough because of work, but they give us food; they are far more beautiful than your

hands which have never done anything."

根据短文内容,判断下列句子正误。正确的用“A”表示,不正确的用“B”表示。

( )1. The three ladies had a quarrel every day.

( )2. The old woman asked for something to eat, but nobody gave anything to her.

( )3. The peasant woman's hands were not as white as the three ladies because of the hard work she had

            done.

( )4. The old woman said that the peasant woman's hands were more beautiful than the three ladies'

            because she liked dark hands better than white hands.

( )5. The three ladies were rich but unkind.

填空题

某生物科技小组对一玉米农田进行实地调查,发现正常玉米的基因型为A_B_,其顶部开雄花,下部开雌花;基因型为aaB_的玉米不能开出雌花而成雄株;基因型为A_bb或aabb的玉米的顶端长出的是雌花而成为雌株(两对基因位于两对同源染色体上)。请你运用所学知识协助解决一些实际问题。

(1)该生态系统的结构包括____________。

(2)在该农田生态系统中,玉米属于第一营养级,它的能量除了未利用的一部分和分解者通过分解作用外,其它的流向是__________。为了提高玉米的产量,对初级、次级消费者应当采取的措施是:禁捕或适当放养次级消费者,用喷洒农药等人工方法来减少初级消费者。这样做的目的是为了____________。

(3)当玉米幼苗长青的时候,“绿色”为蝗虫提供了可以采食的信息。这说明了信息传递在生态系统中的作用是___________。若废弃的农田上会发生群落演替,该演替类型属于______________。

(4)若要调查玉米地里田鼠的种群密度,其方法是_____________。当生态系统处于相对稳定状态时,蝗虫的种群数量的增长率为_____________。

(5)玉米的纯合体雄株和雌株在育种中有重要的应用价值,在杂交育种时可免除人工去雄的麻烦。为了确保纯合子雄株和雌株的杂交后代都是正常植株,那么选育出的符合生产要求的纯合体雄株和雌株基因型分别为____________。