单项选择题

A spider conserves its energy ______.

A．because it constructs new webs daily
B．as it walks over the strands it lays
C．by eating its own web protein and then re-using it in the new web
D．by eating only in the evening

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单项选择题

It is futile to discuss the matter further, because ______ going to agree upon anything today.

A．neither you nor I are
B．neither you nor me is
C．neither you nor I am
D．neither me nor you are

单项选择题

______, work songs often exhibit the song culture of a people in a fundamental form.

A．They occur where they are
B．Occurring where
C．Wherever they occur
D．Where do they occur