正常人体的血液总量约占体重的()
A.45%
B.16%
C.10%
D.8%
E.6%
参考答案:D
In peace, too, the Red Cross is expected to send help to__________there is human suffering.
A.whoever
B.however
C.whatever
D.wherever
在浮游植物→小鱼→海豹→虎鲸这条食物链中,若鲸增加1kg体重,至少消费浮游植物的量为()
A.1kg
B.10kg
C.125kg
D.1000kg