—Why, my new computer is rubbish! Five hours has passed and it still hasn’t finished the downloading.

—Don’t worry. You know, sometimes the Internet ________ be very slow.[ ]

A. can

B. may

C. should

D. must

Technological changes are most likely to result in which of the following effects Evolving technology is likely to result in changes in:

A. educational curriculum only.
B. educational curriculum and the relative demand for various products.
C. the relative demand for various products only.