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问题 多项选择题

血浆代用品与输血相比，优点是（）

A.容易得到

B.不需交叉试验

C.没有感染传染性肝炎的危险

D.容易保存

E.不易引起枸橼酸中毒

答案

参考答案：A, B, C, D, E

单项选择题

下面四个选项中，哪一项能由右边给定的图形的规律演变而成（）

A.选项A

B.选项B

C.选项C

D.选项D
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单项选择题

Donna is a mountain biking enthusiast. One Saturday, she spent the morning biking up an uphill trail at an average speed of 20 kilometers per hour, and then returned by the same route in the afternoon at an average speed of 25 kilometers per hour. If the downhill trip in the afternoon took 3/4 of an hour less than the uphill trek in the morning, how many kilometers did Donna ride each way ？（）

A. 50

B. 55

C. 65

D. 70

E. 75
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