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【单选题】
Which of the following is NOT the reason for the significant drop worldwide in the number of women dying each year from pregnancy and childbirth?A.
There are lower pregnancy rates now in some developed countries.
B.
Health care is now more accessible to most women.
C.
There are more skilled attendants with some medical training to help women give birth.
D.
Large countries like India and China are not included in the study.
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反馈参考答案：
举一反三
【单选题】下面运算正确的是（ ）
A.
（-2x 2 ）?x 3 =4x 6
B.
x 2 ÷x=x
C.
（4x 2 ） 3 =4x 6
D.
3x 2 -（2x） 2 =x 2
【单选题】下面运算正确的是（ ）
A.
3ab+3ac=6abc
B.
4a 2 b-4b 2 a=0
C.
2x 2 +7x 2 =9x 4
D.
3y 2 -2y 2 =y 2
【单选题】下面运算正确的是（ ）
A.
3a+6b=9ab
B.
3a 3 b-3ba 3 =0
C.
8a 4 -6a 3 =2a
D.
1 2 y 2 - 1 3 y 2 = 1 6
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