____________ the news of his father's death, he burst into tears.
After hearing
B. On hearing
C. Having heard
D. While hearing
There ____________, we had to walk home.
A. was no buses
B. be no buses
C. being no buses
D. were no buses
In developing countries people are pouring into overcrowded cities in great numbers．
A. 在发展中国家，人们正涌向一些拥挤的城市。
B. 在发展中国家，人们正大量涌向拥挤的城市。
C. 在发展中国家，人们大量涌向城市，使城市变得拥挤。
D. 在发展中国家，大批的人群正向城市移居，使城市很拥挤。
干货制品的含水量为( )。
A. 10%～150/0
B. 15%～20%
C. 20%～25%
D. 25%～30%
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