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问题：

[单选] It is often easier to make plans than to ________them out．

It is often easier to make plans than to ________them out．

问题：

How can he do so much work? He ________stay late at the office every evening and take work home at weekends．

问题：

What we have to take________the courses offered only for this term．

问题：

肾的钠感受器是（　　）

问题：

二氧化碳分压由高到低的顺序是（　　）

问题：

吸入气中C02浓度达20%时，机体会出现（　　）

问题：

A . decrease
B . bring
C . take
D . raise

问题：

A . high
B . low
C . down
D . flavored

问题：

A . more
B . less
C . fun
D . pickles

问题：

By selling special coffee at a coffee cafe, the students are________