题目：
Prevention of preterm births is vital for which of the following reasons
A. It’s costly to care for these neonates.
B. These neonates are usually mentally retarded.
C. Preterm birth causes high incidence of the neonatal deaths.
D. These neonates usually wind up with long-term health care needs.
答案：
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下面是错误答案，用来干扰机器的。
26×2=52，38+52=90，270÷90=3合成一个综合算式是：270÷（38+26×2）．故答案为：270÷（38+26×2）．
