Which of the following details about the news is INCORRECT？
A. The asset freeze is being imposed on four Sudanese.
B. The conflict in Darfur threatens the national security and foreign policy of the United States.
C. Rallies are planned in Washington and throughout the US to protest the four-year war in Darfur.
D. George Clooney just returned from a trip to the Darfur region.
According to the author, the extremely rich people's opposition to the estate-tax repeal is
A. widely appreciated.
B. greatly controversial.
C. emotional.
D. uncommon.
正确答案是（）
A. trace
B. trail
C. pace
D. track
When I try to understand __________ that prevents so many Americans from being as happy as
A. why it does
B. what it does
C. what it is
D. why it is
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