起重机工作完毕后，抓斗应升至接近上极限位器。
参考答案：错
The old couple decided to ______ a boy and a girl though they had three of their own. [ ]
A. adopt
B. bring
C. receive
D. adapt
某班原有男女生人数的比是3：4，后来又转来2名女生，这时男女人数的比是5：7．这个班现有女生多少人？
