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【单选题】
观察法的主要优点是A.
能准确解释因果关系
B.
适用范围广且方便
C.
反应研究的科学性高
D.
不涉及伦理和隐私等问题
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反馈参考答案：
举一反三
【单选题】You ought to know______ to go out without a overcoat on such a cold day.
A.
had better
B.
better than
C.
better
D.
better of
【单选题】You ought to know ______ than to go out without an overcoat on such a cold day.
A.
better
B.
faster
C.
quicker
D.
worse
【简答题】The construction lasted for about 89 years from 1703 to 1792 by Emperor Kangxi and Emperor Qianlong of Qing dynasty.
【单选题】You ought to know ___ to go out without an overcoat on such a cold day.
A.
rather than
B.
more than
C.
better than
D.
other than
【单选题】There are a few things you ought to know before you ______ a hotel room for your honeymoon.
A.
borrow
B.
rent
C.
reserve
D.
lend
【单选题】You ought to know better than carrying so much money with you.(改错题)
A.
ought to
B.
better
C.
carrying
D.
with
【单选题】You ought to know better than__________ yourself in unnecessary expense．A.to involve###SX
A.
You ought to know better than__________ yourself in unnecessary expense． A.to involve
B.
involve
C.
involving
D.
involved
【单选题】It’s not _______ to judge a man only by his look．You ought to know more about him．
A.
stubborn
B.
grateful
C.
reliable
D.
straight
【单选题】已知某含源一端口网络中的电源发出的功率为50W，负载所吸收的功率为20W ，那么该网络的传输效率为（ ） 。
A.
40%；
B.
60%；
C.
25%；
D.
以上答案都不对
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