单项选择题

Who is told to talk to Ms. Braxton()

A. Parents.
B. Students.
C. Teachers.
D. Performers.

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单项选择题

According to the passage, the use of other metals in gold alloys (). Ⅰ. can be used to make the gold different color Ⅱ. makes jewelry more expensive Ⅲ. makes gold more flexible

A. Ⅰ only
B. Ⅰ and Ⅱ only
C. Ⅱ and Ⅲ only
D. Ⅰ, Ⅱ, and Ⅲ

单项选择题

Africa’s Sahara Desert is the second-largest desert on earth. Based on the information in the passage, what characteristic must the Sahara share with Antarctica()

A. Low temperatures.
B. High temperatures.
C. Frequent blizzards.
D. Low precipitation.

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