The word 'conception' (Line 3, Paragraph 3) has a meaning closest to
A．childbirth.
B．pregnancy.
C．teeth-forming.
D．organs' forming.

A.childbirth.
B．pregnancy.
C．teeth-forming.
D．organs'
B.


【参考答案】

B
语义理解题。该段指出龙凤胎中的女性生育几率降低的原因可能与她们过早接触到了睾丸激素有关，而睾丸激素是由con......

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