单项选择题

A．Knitting socks.
B．Watching television.
C．Chattering.
D．Collecting socks.
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Harvard President A. Lawrence Lowell has introduced the ______ system which offers undergraduates informal specialized instruction in their fields and now it is still a distinctive feature of Harvard education.
单项选择题
A．How to produce pollution free bus.B．How to prevent our environment from being polluted.C．Whether to ride a passenger bus or a private car.D．How to reduce the pollutants produced by bus.
A．How to produce pollution free bus.
B．How to prevent our environment from being polluted.
C．Whether to ride a passenger bus or a private car.
D．How to reduce the pollutants produced by bus.
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