—A ruler is 2 dollars and a pen is 3 dollars. How much are they? —They are ________. 
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A
$2
B
$3
C
$4
D
$5
推荐题目
How do we say the number “4,135”?
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A
four thousand, one hundred, thirty five
B
four thousand, one hundred and three five
C
four thousand, one hundred and thirty five
D
four thousand, one hundred and thirty-five
______ volunteers are working for 2014 International Horticulture Exposition in Qingdao.
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A
Thousands of
B
Two thousands
C
Thousand
D
Two thousands of