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问题 单项选择题 A1/A2型题

含有糖的培养基，高压时避免糖的破坏，高压15分钟时温度应为（）

A.126.2℃

B.121.3℃

C.113.0℃

D.105.7℃

E.102.3℃

答案

参考答案：C

单项选择题

松鼠妈妈采松果，晴天每天可采20个，雨天每天只能采12个。它一连几天共采了112个松果，平均每天采14个。这几天中有几天下雨？（）

A.3

B.4

C.5

D.6
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单项选择题

If x dollars are invested at 12 percent for one year and y dollars are invested at 8 percent for one year, the annual income from the 8 percent investment will exceed the annual income from the 12 percent investment by $64. If $5,000 is the total amount invested between x and y, how much is invested at 12 percent ？（）

A. $1,680

B. $1,997

C. $3,003

D. $3,320

E. $3,500
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