北豆腐应洁白细嫩，表面光润，四角平整，厚薄一致，( )，无杂质，无异味。
A．挺直结实
B．柔韧结实
C．有硬度
D．有弹性
参考答案：D
News came from the school office ________ three students had been admitted to Wuhan University.[ ]
A. which
B. what
C. that
D. where
钩端螺旋体病后的免疫力是 （）
A.免疫力很低
B.获得较强的同型免疫力
C.获得较强的各型交叉免疫力
D.对各型均无免疫力
E.获得带钩端螺旋体免疫力
