问题 选择题

制作口腔上皮细胞的临时装片时,要滴生理盐水的作用是

A.漱口用

B.染色用

C.为细胞提供营养

D.保持细胞形态

答案

答案:D

此题考查的是制作口腔上皮细胞临时装片,在制作人的口腔上皮细胞临时装片时,需在载玻片上滴一滴浓度为0.9%的生理盐水,由于0.9%生理盐水的浓度与人的组织细胞液的浓度一致,故可以维持细胞的正常形态,不至于细胞因吸水膨胀,也不至于因失水而皱缩。

阅读理解

A 37-year-old man in Australia’s Northern city Darwin ,Norm Pethrick, was praised for jumping onto a crocodile’s back to save his wife Wendy at Litchfield National Park, a popular tourist spot southwest of Darwin, a local newspaper reported.

Ms Pethrick was standing on a river bank Wednesday afternoon when the saltwater crocodile lunged (扑), locking its jaws on both her legs as it tried to drag her underwater. Norm Pethrick, who with his wife had been collecting water, immediately went to help her. He jumped onto the back, poked (戳) the eyes of the crocodile and finally got his wife free. Ms Pethrick was later taken to Hospital for a medical treatment. The doctors said she was suffering eight puncture wounds (伤口) in her right leg, a puncture wound in her left leg and a serious cut to one of her fingers.

“This could have been a fatal and tragic situation,” said Dr Len Notaras, according to a local report. He said Ms Pethrick was saved by her husband’s “quick and diligent actions”. Dr Notaras also said she would remain in hospital for three more days and have an operation to clean the wounds, which are easy to get infected because of bacteria (细菌) on the teeth of the crocodile.

小题1: This passage is most likely to be found in _____.

A.a newspaper

B.a travel guide

C.a textbook

D.a novel小题2:The crocodile attacked Ms Pethrick when she was ______.

A.swimming in the river

B.watching the crocodile

C.standing on the river bank

D.fishing in the water小题3:According to the passage, Norm Pethrick can be described as following EXCEPT ______.

A.brave

B.diligent(勤勉的)

C.quick

D.humorous小题4:Which of the following would be the best title for this passage?

A.The husband should save the wife

B.A man saves wife’s life from crocodile’s jaws

C.A crocodile is not so dangerous as people imagine

D.Human beings can beat crocodiles sometimes

判断题