影响病毒感染机体的主要因素包括哪些？（）
A.病毒的致病性
B.病毒的立体结构特征
C.病毒的传播媒介
D.病毒的宿主范围
参考答案：A, C, D
We haven't heard from her for weeks. How do you suppose _____ with her studies now? [ ]
A. is she getting along
B. she gets along
C. she is getting on
D. she had got on
糖化锅的搅拌器尺寸设计非常重要，它的转速必须与锅体直径相适应，而且不得超过3m/s的线速度。
