题目内容：
Scientists are not sure how serious the effects of global warming will be.
参考答案：
答案解析：
单选题：Scientists are not sure how serious the effects of global wa
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临时到外地从事经营活动的单位和个人申请领购发票的，交纳的保证金最多是（ ）。
临时到外地从事经营活动的单位和个人申请领购发票的，交纳的保证金最多是（ ）。
Mary just told us a very fascinating story.
Mary just told us a very fascinating story.
Jack consumes a pound of cheese a day.
Jack consumes a pound of cheese a day.
Cancer occurs when cells in the body divide without
Cancer occurs when cells in the body divide without
检验流程图和工艺流程图、生产流程图（ ）。
检验流程图和工艺流程图、生产流程图（ ）。