水玻璃浓度通常用______来表示。
A.密度
B.密实度
C.粘结力
D.稠度
参考答案:A
—____ your trip to Beijing?
—It was great. [ ]
A. How is
B. What is
C. How was
D. What was
What languages ________ in that country?
German and English.
A.are speaking
B.are spoken
C.speak
D.is spoken