The human ______ is the center of higher nervous activity.

The higher the standard of living and greater the national wealth, the ______.A．greater is

An a.cswitchboard is usually_____ the corresponding d.cboard because of the higher voltage

The passage is against the idea that______.A．human activities lead to the extinction of so

The research group warns that______.A．higher education is a waste of moneyB．the price of c

The capital city of Canada is______, which is an important financial and commercial center

In______, Chinatown has been the center of its Chinese community since the 1850s, which is