（）是金属模样中应用得最多的一种材料。
A.铝合金
B.铸铁
C.铜合金
D.铸钢
参考答案：A
The government desired that immediate measure _____ to help the people trapped in the mine. [ ]
A. be taken
B. would be taken
C. should take
D. was taken
如右图，四个平行箭头中指向东方的是（）
A.①
B.②
C.③
D.④
