单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．Some sea creatures developed backbones.
B．The first giant squid was captured.
C．Some sea creatures shed their shells.
D．Sea life became more intelligent.

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单项选择题

A．It’s manufactured to be strong.B．It bends without breaking.C．Thatchers nail it down securely.D．The winds can pass through it easily.

A．It’s manufactured to be strong.
B．It bends without breaking.
C．Thatchers nail it down securely.
D．The winds can pass through it easily.

Questions 19 to 22 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。

Questions 19 to 22 are based on the conversation you have just heard.