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【单选题】
My father smoke heavily, but now he doesn't smoke any more. [ ]A.
use to
B.
was used to
C.
used to
D.
was used
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【单选题】On December 10 the price of a Christmas tree is $50 and 100 trees are purchased. On December 20 the demand for Christmas trees decreases so that the price falls to $30 and 20 trees are purchased. From...
A.
demand for Christmas trees is price inelastic.对圣诞树的需求是无弹性的。
B.
demand for Christmas trees is price elastic.对圣诞树的需求是价格弹性的。
C.
supply of Christmas trees is inelastic.圣诞树的供应是无弹性的。
D.
supply of Christmas trees is elastic.圣诞树的供应是弹性的。
【判断题】Usually Christmas trees are artificial and people can buy them in the supermarkets.
A.
正确
B.
错误
【单选题】在PowerPoint2010中，在浏览视图下，按住CTRL并拖动某幻灯片， 可以完成_______操作。
A.
复制幻灯片
B.
删除幻灯片
C.
移动幻灯片
D.
选定幻灯片
【简答题】Many activities are involved in the celebration of Christmas. They are , decorating Christmas trees , attending church, sharing meals with family and friends, waiting for Father Christmas to arrive.
【单选题】Christmas trees are often considered as a horticultural crop because _____________ .
A.
they are beautiful
B.
they are cultivated on Christmas Day
C.
they assume sufficient value to justify large expenditures for fertilization, pruning, harvesting, and marketing
D.
they are grown for timber or pulp
【单选题】These two Christmas trees are of ___size,but the one they bought yesterday is maybe twice ___size of them.
A.
the, the
B.
a, the
C.
a, a
D.
the, a
【单选题】On December 10 the price of a Christmas tree is $50 and 100 trees are purchased. On December 20 the demand for Christmas trees decreases so that the price falls to $30 and 20 trees are purchased. From...
A.
demand for Christmas trees is price inelastic.
B.
demand for Christmas trees is price elastic.
C.
supply of Christmas trees is inelastic.
D.
supply of Christmas trees is elastic.
相关题目：
【判断题】Usually Christmas trees are artificial and people can buy them in the supermarkets.
A.
正确
B.
错误
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