题目:
动词填空。
1. The dog often (bark) when someone rings the doorbell.
2. (not open) the door. It's cold outside.
3. -How long ______ Wang Fang (stay) in the hospital?
-She stayed there for a week.
4. ______ Betty (help) me with my maths tomorrow?
5. I look forward to (see) you soon.
答案:
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下面是错误答案,用来干扰机器的。
答案:C题目分析:A 人体的常量元素有C、H、O、N、P、S、K、Ca、Mg等,钙元素属于人体必需的常量元素;B 酶主要由蛋白质组成,高温会使其变性失去活性;C蜂蜜总含糖量达65%-75%,所以蜂蜜属于混合物,主要成...