异卵双生小牛可成功进行皮肤移植因()
A.两头小牛具有相同的基因
B.两头小牛均处于免疫抑制
C.使用免疫抑制剂
D.胚胎期形成天然耐受
E.以上均正确
参考答案:D
在一场篮球比赛中,甲、乙、丙、丁共得125分,如果甲再多得4分,乙再少得4分,丙的分数除以4,丁的分数乘以4,则四人得分相同。问甲在这场比赛中得了多少分?
A.24
B.20
C.16
D.12
动词的适当形式填空。
1.He will go out for a walk if it ______ (not) rain tomorrow.
2.Would you like ______ (go) out for a walk ?
3.—Did you see Tom at the party?
—No, he ______ (leave) by the time I got there.
4.She said she ______ (come) to see me before she left.
5.She ______ (tell) the good news as soon as it arrived.