皮皮学，免费搜题
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【单选题】
由于实验性研究是以人为研究对象,所以必须慎重考虑:( )A.
医德问题
B.
调查员的培训
C.
研究的持续时间
D.
开展研究的医院
E.
不同病种的对照
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】听力原文：M: At the Jade Restaurant, it's hard to find a table. W: No surprise there. It' s the best one around. Q: What do we learn from this conversation? (18)
A.
The Jade table is difficult to find nowadays.
B.
Jade is too hard to be made into a table.
C.
Jade restaurant is very popular in the area.
D.
It' s surprising that the restaurant doesn' t have enough tables.
【单选题】It's hard to avoid mistakes. ______ you correct them, it will be all right.
A.
As long as
B.
In case
C.
Although
D.
Even though
【简答题】下列不属于直接金融工具的是（ ）。
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