单项选择题

Questions 23 to 25 are based on the conversation you have just heard.

A．Why species don’t avoid extinction by adapting.
B．Why species become extinct at the rate they do.
C．Why humans aren’t extinct.
D．How many species aren’t extinct.

<上一题目录下一题>

热门试题

填空题

Nanotechnology has resulted in a wide range of amazing, practical discoveries such as stain-resistant trousers and self-cleaning toilets.

单项选择题

A．Her car is being repaired.B．Parking is difficult in the city.C．The cost of fuel has increased.D．She wants to help reduce pollution.

A．Her car is being repaired.
B．Parking is difficult in the city.
C．The cost of fuel has increased.
D．She wants to help reduce pollution.

Questions 23 to 25 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。

Questions 23 to 25 are based on the conversation you have just heard.