One theory, ________ suggested by Harvard University, is that humans began cooking their food, thereby releasing nutrients locked in the raw food and reducing the time needed to chew it.
A.which | B.as |
C.that | D.what |
. She brought with her three friends, none of ______ I had ever met before.
A.them | B.who | C.whom | D.these |
. — Why does the Lake smell terrible?
—Because large quantities of water______.
A.has polluted | B.have been polluted |
C.has been polluted | D.is being polluted |
Peter’s jacket looked just the same as Jack’s, but it cost ______ his.
A.as much twice as | B.as twice much as |
C.much as twice as | D.twice as much as |
. Everybody was touched ______words after they heard her moving story.
A.beyond | B.within | C.of | D.in |
. Experts have warned ______ of the health risks caused by passive smoking.
A.at a time | B.at one time | C.for some time | D.for the time |