单项选择题

The author's purpose of writing this passage is to______.

A．argue for teaching bright and not-so-bright students in the same class
B．recommend pair work and group work for classroom activities
C．offer advice on the proper use of the library
D．emphasize the importance of formal classroom teaching
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单项选择题
People did not begin to use unmanned vehicles in undersea exploration until recently because of______.
A．the communication problem
B．the movement of waves
C．the ocean depths
D．the problem of vacuum
单项选择题
Which of the following is NOT mentioned in the passage
A．New techniques are continually developed and new machines invented for undersea exploration.
B．If not well built, a submersible is most likely to get crushed in deep water.
C．A submersible, when manned, looks very like a spaceship.
D．In certain respects undersea exploration is often faced with the same problem as the space exploration.
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