对于靛基质试验，下列说法正确的是（）。A.培养基中要含有丰富的色氨酸 B.培养基中不

The nervous-looking young man had waited for a few moments—outside the jeweler’s before he got enough courage to enter. He was warmly greeted by a young assistant. James felt a rush of blood to his face as he explained he would be bringing in his future wife to choose a birthday present. The assistant listened carefully and told him he’d better buy a necklace. He wasn’t used to buying jewellery and was a little worried about over-spending. After some discussion as to a reasonable price and the type, the assistant showed him dozens of necklaces and helped him to choose. At last James chose one and left the shop promising to return at five o’clock. When, half an hour later than planned, James did return to the shop with his future wife, Laura, the assistant acted as if she had never seen him before. When she was asked to show them some necklaces, she first brought out some inexpensive ones for them to choose, and then gave them the one she had prepared. A choice was soon made and they went away satisfied. James would certainly come back to buy what he wanted.

52. A good title for this passage is________.

A. A Clever Assistant                 B. Buying a Birthday Present

C. How to Choose a Necklace          D. A Brave Young Man

53.The word “overspending” in this passage means__________.

A. spending too much money

B. spending too much time

C. spending more time than he planned

D. spending too much time and too much money

54. When James told the assistant why he wanted to buy a present, his face_______.

A. turned pale                   B. turned  red       C. turned yellow                 D. turned black

55. James and Laura reached the shop at        .

A. 4:30       B.5:00         C.5:30         D.6:00

56. James would come back to buy what he wanted because_______.

A. the assistant knew how to satisfy the people who came to buy things

B. the necklace was good

C. Laura liked the necklace

D. the assistant who served James was very beautiful

似蚓蛔线虫的感染阶段为（）

A.蛔虫受精卵

B.蛔虫未受精卵

C.感染期蛔虫卵

D.丝状蚴

E.蛔虫受精卵、未受精卵

甲公司与乙公司订立合同后，甲公司将该合同转让给丙公司，这种情形时就发生（）

A.债的变更

B.债的移转

C.债的消灭

D.债的产生

组成髂肋肌沟的肌肉是（）

A、头半棘肌与髂肋肌

B、头寰最长肌与髂肋肌

C、髂肋肌与夹肌

D、背腰最长肌与髂肋肌

E、髂肋肌与颈多裂肌

【背景资料】某工程制冷系统的控制：冷水机组自带自动调节系统控制开启台数、冷量；设备开停顺序依据一定的程序进行；冷冻机房内空调供回水管设压差旁通阀，机组定流量运行；冷却塔根据出水温度，控制风机开、停，同时供回水管设旁通阀。

请根据上述背景资料完成以下选项。其中判断题二选一（A、B选项），单选题四选一（A、B、C、D选项），多选题四选二或三（A、B、C、D选项）。

选择压力传感器的量程应为该点压力正常变化范围的（）倍。

A、0.8-1.0

B、1

C、1.2-1.3

D、2