Glass frogs （玻璃蛙） are not really made of glass，but their skin is transparent，just like glass.In fact，the skin on the underside （底部） of a glass frog is so transparent that you can see the inside of its body.Without using an instrument （儀器），you can see the frog's heart and other organs（器官）.Sometimes you can even see the food moving through the body.
    These unusual-looking frogs can be difficult to find in the rain forests of Central and South America.The skin on their fronts and the green color of their backs often blend in （融入） with the leaves（葉子） they rest on.Also，they are just about the size of a coin.
    These frogs have an interesting way of catching insects.Scientists believe the glass frog's back looks like the frog's eggs.If a fly （蒼蠅） flies down for a meal on a frog's back，it will be in for a surprise when the glass frog opens its mouth.
    The male glass frog protects （保護(hù)）real eggs.To keep away unwanted animals，a male glass frog will try to drive away other animals if they get too close.At first.jye.ai male frog makes loud noises to warn （警告） other animals to leave the area.If that does not work，the frog may fight with other animals until they give up and leave.

（1）What does the underlined word "transparent" mean？

B

B

A.Clean.
B.Clear.
C.Beautiful.
D.Natural.
（2）Which paragraph tells us how class frogs protect their eggs？

D

D

A.Paragraph 1.
B.Paragraph 2.
C.Paragraph 3.
D.Paragraph 4.
（3）Which of the following is TRUE about glass frogs？

A

A

A.It's difficult to find them in the rain forests.
B.They can't move fast because they are big.
C.It's easy for them to find food because they don't make noises.
D.They always fight with others animals.
（4）What is the writer's purpose（目的） in writing this passage？

C

C

A.To tell us how to find glass frogs.
B.To explain （解釋?zhuān)?why glass frogs are important.
C.To tell us something about glass frogs.
D.To ask us to protect glass frogs.