The first crocodiles(鳄鱼) lived on the Earth about 240 million years ago. How much do you know about these dangerous animals? Here are some amazing facts about them.
◆ The biggest crocodile is the saltwater crocodile. It can be as long as seven metres!
◆ If you take a bright light at night over a river with crocodiles inside, you will see pairs of red spots (点). Those are the crocodiles’ eyes. They can see well at night.
◆ When you see a crocodile with its mouth open, don’t be scared. That just tells you it’s too hot.
◆ On the beach, crocodiles get tired very quickly, but they can stay in the water for 2-3 hours.
◆ Most crocodiles can live up to 70 years old!
小题1: When did the first crocodiles live?
A．About 2,400,000,000 years ago.
B．About 240,000,000 years ago.
C．About 24,000,000 years ago.
D．About 2,400,000 years ago.小题2:The writer thinks the crocodile is .
A．lovely
B．dangerous
C．fun
D．cool小题3: What’s the meaning of the underlined word “scared”?
A．Happy.
B．Sad.
C．Comfortable.
D．Afraid.小题4: Which of the following is right?
A．Crocodiles often open their mouths when it’s hot.
B．Crocodiles can stay on the beach for 2-3 hours.
C．All the crocodiles can live up to 70 years old.
D．The writer talks about four facts about crocodiles.
小题1:B
小题2:B
小题3:D
小题4:A
题目分析：本文叙述了鳄鱼在2.4亿年前就生活在地球上，最大的鳄鱼是盐水里的鳄鱼，长达7米，晚上鳄鱼的视力也很好。当鳄鱼感到热的时候，它就会张着嘴。它的寿命一般能达到70年。
小题1:细节理解题。根据The first crocodiles(鳄鱼) lived on the Earth about 240 million years ago.鳄鱼在240，000，000年前生活在地球上，故选B。
小题2:细节理解题。根据How much do you know about these dangerous animals? 可知作者认为鳄鱼是危险的动物，故选B。
小题3:词义猜测题。根据When you see a crocodile with its mouth open可推知这里可能误认为鳄鱼要吃人，所以人们都会感到害怕，故选D。
小题4:细节理解题。根据When you see a crocodile with its mouth open，That just tells you it’s too hot.可知鳄鱼热的时候就张着嘴，故选A。