【单选题】Scientists in India have invented a new way to produce electricity．Their invention does not get its power from oil, coal or other fuels．It produces electricity with the power of animals．India has abou...

【单选题】小牛”导弹家族的最大特点是（）

【单选题】从小牛肠黏膜或大肠杆菌中提取的酶是（）.

【单选题】异卵双生小牛可成功进行皮肤移植因（）

【单选题】犊牛是指出生后到＿＿个月的小牛

【简答题】大牛和小牛的头数比是5：4，表示小大牛少14．______．

【单选题】小牛核的部位在（）。

【判断题】两头黑牛交配，产下了一头棕色小牛，可见棕色牛是隐性形状．______．（判断对错）

【单选题】Passage FourVegans try to live, as much as possible, in a way that avoids exploiting and being cruel to animals. This means following a plant-based diet. Vegans do not eat animals or animal-based prod...

【简答题】大牛和小牛头数的比是4：5，表示大小牛少14．______．（判断对错）