单项选择题

Teachers are different in their opinions about______.

A．the difficulties in teaching spelling
B．the role of spelling in general language development
C．the complexities of the basic writing skills
D．the necessity of teaching spelling

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单项选择题

The underlined word carbon (Par

A．2) stands for_______.A. its intelligence and cost are beyond questionB. it is able to bear the rough environmentC. it is made as complex as the human brainD. its architecture is different from that of the present ones

单项选择题

In what way can we make a machine intelligent

A．By making it work in such environments as deserts, oceans or space.
B．By working hard for 10 or 20 years.
C．By either properly programming it or changing its structure.
D．By reproducing it.