《2025年评优监测课时作业八年级英语上册译林版》

阅读下列短文,从每题所给的A、B、C、D四个选项中选出最佳选项。
A
The Yangtze River dolphin is the only kind of dolphin that lives in freshwater all its life. Scientists say that the finless freshwater dolphin that has lived in the Yangtze River for over 20 million years, will die out in 15 years. It's in danger of disappearing forever.
Dangers:
Dredging(挖掘) of their habitat.
Heavy boat traffic in the Yangtze River.
Insecticide(杀虫剂) and mercury(汞).

()1. How long has the Yangtze River dolphin lived in the Yangtze River?
A. For 20 million years.
B. For less than 20 million years.
C. For more than 20 million years.
D. We don't know.
()2. What is NOT a danger to the Yangtze River dolphin?
A. Dredging the river bed.
B. Insecticide and mercury.
C. Swimmers.
D. Heavy boat traffic in the river.
()3. What does the Yangtze River dolphin mainly eat?
A. Fish and shrimps.
B. Fish.
C. Shrimps.
D. Sharks.
()4. Which of the following is TRUE?
A. The Yangtze River dolphin lives in freshwater when they are young.
B. Most fish live in freshwater all their lives.
C. Maybe all kinds of dolphins will disappear in 15 years.
D. Adult finless freshwater dolphins have almost the same size as a human.

答案： 1.
(1)C
(2)C
(3)A
(4)D
2.
(1)C
Content: "Scientists say that the finless freshwater dolphin that has lived in the Yangtze River for over 20 million years..." So the answer is C.
(2)C
Content: The dangers are "Dredging of their habitat. Heavy boat traffic in the Yangtze River. Insecticide and mercury." Swimmers are not mentioned as a danger. So the answer is C.
(3)A
Content: From the picture, the main diet of the Yangtze River dolphin is fish and shrimp. So the answer is A.
(4)D
Content: From the picture, an adult Yangtze River dolphin is 1.2 m - 1.9 m in size, which is almost the same as a human swimmer. So the answer is D.