单项选择题

Questions 32 to 35 are based on the passage you have just heard.

A．There were laws that protected the rights of slaves.
B．Nobody in the U. S. disagreed with slavery before 1800.
C．There was progress in the opposition to slavery.
D．The end of the Civil War enabled blacks to enjoy equality
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单项选择题
Which of the following is TRUE according to Para. 1
A．Nowadays, scientists pictured the circulation of ocean’s water mass as consisting of large slow-moving currents.
B．Before 1965 ,the concept of scientists produced only a rough approximation of the true circulation.
C．Researchers began to do research on the developed techniques and equipment.
D．These instruments disclosed an expected level of variability in the deep ocean.
单项选择题
A mussel grips a hard surface very firmly to ______.
A．seal itself from being eroded by sea water
B．produce the waterproof super glue
C．protect itself from being blown away by strong wind
D．protect itself from being the food of other animals
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