当北京处于夏季时,澳大利亚处于()
A.春季
B.夏季
C.秋季
D.冬季
参考答案:D
---When ______ again? ---When he ______, I’ll let you know.
A.he comes; comes
B.will he come; will come
C.he comes; will come
D.will he come; comes
什么是海绵铁?