单项选择题

Which of the following situations is among the troubles print has

A．It is dear to find printed materials.
B．Frequent editing is needed for better layout.
C．Paper is passed around quickly.
D．The space to restore articles is not enoug

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单项选择题

The author wants to tell us in Par

A．1-4______.A. DNA' s functionsB. DNA' s applicationsC. DNA' s researchD. DNA' s techniques

单项选择题

What is the main idea of Par

A．5-7(last three paragraphs)A. DNA' s future tendencies.B. DNA' s controversy.C. DNA' s potentials.D. DNA' s social issues.