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问题 单项选择题

太子参粉末中可见草酸钙

A．主产于河南
B．主产于山西、河南、河北
C．主产于甘肃
D．主产于四川、湖北
E．主产于江苏、湖北、河南

答案

参考答案：A

选择题
下列化简中正确的是（　　）
A．3
2b
3
=
2b
B．
5x
12y3
=
1
6y2
15xy
C．
b
a2
-
a
b2
=(
1
a
-
1
b
)
b-a
D．
b
2a2
=
1
2a
b
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单项选择题

Questions 14-23


·Look at the ten statements for this part.
·You will hear a passage about "the number of genes ". You will listen to it twice.
·Decide whether you think each statement is right(R), wrong(W) or not mentioned(NM).
·Markyour answers on the Answer Sheet.

No genes found by the two teams were the same.

A．Right

B．Wrong

C．Not Mentioned
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