单项选择题

A．They should help maintain the equipment.
B．They should keep a watchful eye on their children.
C．They should stop their children from climbing ladders.
D．They should teach their children how to use the equipment.
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单项选择题
A．Many species have moved further north.B．Many species have come into existence.C．Many species have developed a habit of migration.D．Many species have become less sensitive to climate.
A．Many species have moved further north.
B．Many species have come into existence.
C．Many species have developed a habit of migration.
D．Many species have become less sensitive to climate.
单项选择题
What do we know about Iceberg Water from the passage
A．It is a kind of iced water.
B．It is just plain tap water.
C．It is a kind of bottled water.
D．It is a kind of mineral water.
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