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？
