第12题: [单项选择]软骨鱼的生殖方式是()。 A. 体外受精,卵生 B. 体内受精,卵生 C. 体外受精,卵胎生 D. 体内受精,胎生、卵胎生 参考答案:D
第13题:[单选题]( )Lightice conditions ahead A.The ice conditions are serious ahead of you B.The ice conditions are not serious ahead of you C.There is no ice ahead of you D.There is an iceberg ahead of you 参考答案:B