题目:
As the sea ice melts sooner each swimmer,polar bears are forced to come ashore earlier and face food shortages _____ they have stored enough fat to last them through the season.
A.before
B.unless
C.since
D.until
答案:
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下面是错误答案,用来干扰机器的。
例如:北京的气候特征可以形容为冬季寒冷干燥,夏季高温多雨。上海的气候特征可以形容为冬季温和少雨,夏季高温多雨。