对“商品—货币—商品”理解正确的是 ①这是商品交换公式②这是商品流通公式③货币也

阅读短文，从每小题所给的A、B、C、D四个选项中选出最佳选项。

      Helen Beckman, an old woman of fifty, always thought herself right. Sometimes she made a mistake, but

she tried her best to deny (否认) it.

     One day, she was walking along the street when she met with another woman. She remembered it seemed

like one of her friends. So she looked at her very carefully.

     Then she said, "Sandy Smith, my old friend! Well, well, well I haven't seen you for ten years." 

     She looked at the woman up and down. But the woman was puzzled (迷惹不解的) and couldn't know what

to say. 

     "But you've changed, Sandy," she went on. "You used to be fat but now you're thin." She smiled at the

woman again. "But, oh, you have changed," she said. "I've never known anyone change so much. You used to

have thick hair but now it's very thin. You didn't use to wear glasses but now you're wearing really thick ones." 

     She smiled at the woman again. 

     "But you're still the same Sandy Smith I used to have coffee with every week. We had some good times,

didn't we, Sandy?" 

     "Excuse me, madam," the woman said, "but my name isn't Sandy Smith."

     Helen thought for a minute, and then she said, "So you've changed your name as well, haven't you?"

1. Helen Beckman never thought _______. [ ]

A. she was too old.

B. she was free at home.

C. she did something wrong.

D. she was bad to her friends.

2. _______, so she looked at her up and down. [ ]

A. Helen Beckman didn't know the woman

B. Helen Beckman was not sure if the woman was her friend

C. Helen Beckman hoped to talk with the woman

D. The woman forgot to say hello to Helen Beckman

3. The man was puzzled because _______. [ ]

A. she didn't know Helen Beckman all

B. she forgot Helen Beckman was her friend

C. Helen Beckman changed greatly

D. Helen Beckman talked too much

4. _______, so she remembered her well. [ ]

A. Sandy Smith often wrote to Helen Beckman

B. Sandy Smith often went to see Helen Beckman

C. Sandy Smith was one of Helen Beckman's neighbours

D. Sandy Smith often had coffee with Helen Beckman

5. Which of the following is true? [ ]

A. Sandy Smith changed her name.

B. Helen Beckman made a mistake again.

C. Sandy Smith was much fatter than before.

D. Sandy Smith forgot her old friend.

人的正常与白化病受基因A和a控制，正常与镰刀型细胞贫血症受基因B和b控制，两对基因分别位于两对常染色体上，假设白化病基因与相对应的正常基因相比，白化基因缺失了一个限制酶的切点。图一表示某家族遗传系谱图，图二表示甲、乙、丙3人白化基因或相对应正常基因的核酸分子杂交诊断结果示意图。据图回答下列问题。

(1)由图二可以判断出乙和丙的基因型分别是_________、_________。

(2)已知对③④进行核酸分子杂交诊断，其电泳结果都与甲的相同。⑥的基因型可能是_______，⑨是正常的可能性为________。

(3)白化病与镰刀型细胞贫血症这两种性状与基因的关系，所体现的基因控制性状的方式分别为：______；_______。

(4)如果要通过产前诊断确定⑨是否患有猫叫综合征，常用的有效方法是_______。

在下列试验操作中，哪个不需加入Ca²⁺（）

A.RVVT

B.APTT

C.PT

D.STGT

E.TT

下列关于光合作用的叙述，不正确的是（）

A.光反应需要光，不需要酶，暗反应不需要光，需多种酶

B.光反应在叶绿体的片层结构薄膜上进行，暗反应在叶绿体的基质中进行

C.光反应分解水生成［H］，暗反应将CO2还原成葡萄糖并生成H2O

D.光反应吸收光能形成ATP，暗反应将ATP中化学能储存在有机物中

大连商品交易所黄大豆一号期货合约任何交易时刻都有（）个不同月份的合约可供交易。

A.6

B.7

C.8

D.9