单项选择题A．They are too many and she can’’t read them all.B．They are too boring to read.C．She feels too tired to read any books.D．They are too heavy for her to carry.

单项选择题A．Using computers is a waste of resource.B．Many people don’’t turn off the computers after using them.C．Computers are run by electricity.D．A computer is not a must for working.