单项选择题

What does the underlined word "them" in PARAGRAPH 5 refer to？

A. Gift cards.
B. Americans.
C. $110 million.
D. CEB TowerGroup projects.

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单项选择题

What is the author's attitude towards online self-gifting？

A. Unclear.
B. Neutral.
C. Negative.
D. Supportive.

单项选择题

In__________drills, the students change a given structure in a way so that they are exposedto other similar structures, which also helps them have a deeper understandingof how the structures are formed and how they are used.

A. substitution
B. transformation
C. comprehension
D. communicative