单项选择题

A．The location of certain ocean rocks.
B．The effect of water pollution on barnacles.
C．The medical value of some synthetic products.
D．The composition of the barnacle’s glue.
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单项选择题
A．Because marketing groups have collected consumers’ information for years.B．Because marketing groups can send messages around the world for free.C．Because people keep down junk mail to a manageable level.D．Because it is cheaper to mail packages to large groups of people.
A．Because marketing groups have collected consumers’ information for years.
B．Because marketing groups can send messages around the world for free.
C．Because people keep down junk mail to a manageable level.
D．Because it is cheaper to mail packages to large groups of people.
单项选择题
A．She needs to do some exercises.B．She should put on her jogging suit.C．It’s too hot to go running.D．His jogging suit isn’t warm enough.
A．She needs to do some exercises.
B．She should put on her jogging suit.
C．It’s too hot to go running.
D．His jogging suit isn’t warm enough.
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