磁选设备是用于去除()的各种机械的总称。
参考答案:磁性金属杂质
A.They want to change the way English is taught.
B.They learn English to find well-paid jobs.
C.They want to have an up-to-date knowledge of English.
D.They know clearly what they want to learn.
Let's go and have ______ her family photo. [ ]
A. a look
B. look at
C. a look at
D. the look at