1. When ---in arctic regions, the Aleuts construct igloos as temporary winter shelters.
(A) travel
(B) to travel
(C) traveling them
(D) traveling
2. Most substances contract when they freeze so that the density of a substance's solid is ---of its liquid.
(A) than the higher density
(B) higher than the density
(C) the density is higher than that
(D) the higher the density
3. The mechanism by which brain cells store memories is ---clearly understood.
(A) none
(B) no
(C) not
(D) nor
4. Desert animals ---a means of retaining moisture in such a hot, dry climate if they are to survive.
(A) need
(B) needing
(C) to need
(D) was needed
5. ---state of Wyoming is also known as the "Equality State" because Wyoming women were the first in the nation to vote.
(A) The
(B) There is a
(C) That the
(D) As the
6. The less the surface of the ground yields to the weight of the body of a runner, ---to the body.
(A) the stress it is greater
(B) greater is the stress
(C) greater stress is
(D) the greater the stress
7. And ideal is a standard ---people judge real phenomena.
(A) how
(B) of
(C) by which
(D) for it
8. Maine has ---weather than most of the other states in the continental United States.
(A) coolest
(B) the coolest
(C) cooler
(D) the cooler
9. Amoebas are ---small to be seen without a microscope.
(A) far too
(B) far and
(C) so far
(D) as far as
10. Graphite conducts electricity ---does not burn.
(A) because
(B) if
(C) when
(D) and
参考答案：
BBACD
ACADC
编辑推荐：
更多精彩内容请关注读书人网（http://www.reader8.net/） 托福考试频道！