题目内容

下列哪种脂类可以合成维生素D3( )

A. 甘油三酯
B. 胆固醇
C. 磷脂
D. 必需脂肪酸

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必需脂肪酸缺乏,可引起生长缓慢、生殖障碍、皮肤受损(出现皮疹)等。

A. 对
B. 错

Bob: I'm wondering if it is going to be fine tomorrow.You: 1 . (说明天我们要开运动会).We shall have a sports meet tomorrow.Bob: But look at the fog. You can only see things within a short distance.You: But don't you see 2 .(提醒说难道你没看到风在开始把它吹散吗)?Bob: Don't be so sure.You: I bet 3 . (说明天天气会好的).Bob: You've heard the morning weather forecast, haven't you?You: No. 4 (问预报怎么说)?Bob: It says it's going to be foggy.You: That's why you're worrying, isn't it?Bob: 5 (问这就是他担心的原因，对不对)?

请从下列方框选出正确的选项补全方框下的对话，有2个多余的选项。答案只需填写选项所对应的字母即可，如：1. AA：It is such a lovely day. I love sunshine.B：1.___A：I hope it stays like this.B：2._A：Is the weather usually like this here?B：A bit hotter than today.A：3._B：It's pretty cold and it often snows in winter. 4._A：A lot like the weather here, not too hot or cold.B：I heard it rains a lot. 5._____A：Mmm, yes. It rains but not any more than other places.

某瞬时，一点的速度为0，则加速度不一定为0.

A. 对
B. 错