SLE的标记性抗体
A．抗组蛋白抗体 B．抗Sm抗体 C．抗SErB抗体 D．抗Scl-70抗体 E．抗Jo-1抗体
参考答案：B
合并同类项。
（1）3a2-2a+4a2-7a；
（2）-3a+[4b-（a-3b）]。
50. John is on the bottle again. This sentence probably means _____.
A．John is standing on a bottle now.
B．John is holding a bottle now.
C．John threw away a bottle.
D．John begins to drink wine again.
