国外品种猪因为其屠宰率高、肉脂品质好和生长速度快被我国养猪业广泛引入。()

A. children are much healthier.
B. infant mortality rates are lower.
C. the size of the family becomes smaller.
D. means of birth control are more effective.

A. It led to steep falls on global exchanges.
B. It brought a little rise on European exchange.
C. It had no affects at all.
D. It didn"t cause any sustained falls.

A. There were about 80 people in the boat when the accident happened.
Bus service was stopped in Congo because of the poor road conditions.
C. It is normal in Congo that overturn incidents often occur.
D. The boat accident was mainly because of the severe weather.