雅鲁藏布江河谷地带种植的青稞和小麦穗大、颗粒饱满的原因是 [ ]
A.日照时间长,昼夜温差大
B.水源充足,昼夜温差大
C.气温较低,没有病虫害
D.地势高,土壤肥沃
答案:A
She bought________eggs yesterday, but there were________them broken. [ ]
A. two scores of; scores of
B. scores of; two scores of
C. scores of; two score of
D. score of; two scores
支气哮喘发作时的典型体征是
A.双肺呼气性的哮鸣音
B.肺吸气性的哮鸣音
C.双肺可闻及散在干鸣音
D.肺可闻及湿性罗音
E.肺广泛支气管呼吸音