题目内容
（请给出正确答案）
The waterproof super glue originates in ______.
A．the mussel's tongue-shaped foot
B．some glands in the mussel's body
C．the thread given off by the mussel
D．the channel of the mussel's foot
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更多“The waterproof super glue orig…”相关的问题
A mussel grips a hard surface very firmly to ______.
A．seal itself from being eroded by sea water
B．produce the waterproof super glue
C．protect itself from being blown away by strong wind
D．protect itself from being the food of other animals
The Romans first found truly waterproof cement in the early 19th century.
A．Y
B．N
C．NG
What is the meaning of the word "waterproof" in the fourth paragraph？
A．Covered with water.
B．Full of water.
C．Cleaned by water.
D．Not allowing water to go through.
Some people in Finland wear paper boots in the snow in winter because
A．they are waterproof.
B．nothing could be warmer.
C．they are convenient.
D．they are durable.
(21)
A．That's impossible.
B．I'm sure it's all right.
C．Did you buy it here？
D．What's the trouble？
