The time span between tides______.
A．is shorter in inland seas
B．varies as much as the extent of the tides
C．and the extent of tides depend upon each other
D．is a more constant phenomenon than the extent of the tides
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Politicians, activists and parents owe it to their children to __ educational opportunity, whether that means confronting school boards to __ better-trained teachers, forming charter schools, or going to court to ensure equality of funding for schools in poor areas.
A．appraise ... interest
B．increase... replenish
C．investigate ... discover
D．question...impugn
E．equalize...demand -
[A]feet
[B]hands
[C]head
[D]body -
The boy wanted to ride his bicycle in the street, but his mother told him _______.
[A]not to
[B]not to do
[C]not do it
[D]do not -
The electric plates on the electric eel______.
A．run along the length of its body
B．are found on sides of its head
C．are located in its head
D．are in its tail -
Which of the following factors does not affect the extent of the tides？
A．The composition of the shore soil.
B．The moon.
C．Time.
D．Place.