B. Piranhas like to live in the deep seabed.     C. Piranhas may attack human beings when the water level is low.     D. Piranhas only attack human beings when they cross the river in groups. 61. How does an anaconda kill its victim according to the passage?     A. It often uses its poison to kill its victim.

　　B. It often uses its strength to kill its victim.     C. It kills its victim mainly using its powerful teeth.

　　D. It kills its victim with the help of other snakes. 62. The underlined word “camouflage” in Paragraph 3 means “________”.     A. hide itself by appearing like the surroundings B. terrify and capture the enemy by making much noise     C. move around to search for delicious food

　　D. give off harmful gas to kill the targets 63. Chicken and dogs are mentioned in Paragraph 4 to show that ________.     A. no animals can survive the poison of the golden poison frog     B. they like to wander along the path of the golden poison frog     C. the golden poison frog likes eating them most     D. the poison of the golden poison frog is deadly

　　【答案解析】CBAD

　　C

　　(2017·河北省普通高中质量检测)

　　In an ideal world，people would not test medicines on animals.Such experiments are stressful and sometimes painful for animals，and expensive and time­consuming for people.Yet animal experimentation is still needed to help bridge vast gaps in medical knowledge.That is why there are some 50 to 100 million animals used in research around the world each year.

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