Desertification，the name for ______ happens when farmable land is turned into desert，is a growing world problem.
| A．which | B．where | C．what | D．How |
相关试题
Tom was about to close the windows_____his attention was caught by a bird.
| A．when | B．if | C．and | D．till |
—Is it all right if I keep this photo？
--_______.
| A．No，you don’t | B．No, it shouldn’t | C．I’m afraid not | D．Don’t keep it |
语音知识（共5小题；每小题1分，满分5分）come
| A．cold | B．cock | C．comfort | D．improve |
dead
| A．eager | B．great | C．least | D．health |
united
| A．use | B．ugly | C．upstairs | D．put |
ours
| A．outside | B． cousing | C．nervous | D．clocks |
thirty
| A．theatre | B．thus | C．although | D．feather |
_______ comfortably in a chair, he was completely lost in a magazine.
| A．To sit | B．Sat | C．Sitting | D．Having sat |
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