皮皮学，免费搜题
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【单选题】
酵母菌总数测定宜选取平均菌落数小于多少的稀释级A.
100cfu
B.
200cfu
C.
30cfu
D.
300cfu
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皮皮学刷刷变学霸
举一反三
【简答题】A．He should be careful when using his credit cards. B．He should cook by himself. C．He should stop spending money on entertainment. D．He ought to get rid of his car to save money.
【单选题】Why does the man like Thanksgiving?
A.
He can cook delicious meals.
B.
He likes to cook the dinner.
C.
He really wants to meet his family.
D.
He just wants to play with the kids.
【单选题】He/cook all morning.
A.
He have been cooking all morning.
B.
He has been cooking all morning.
【单选题】关于任务难度与努力程度的关系，说法正确的是( )
A.
任务越简单，越能激励自己努力
B.
任务越难，越能激励自己
C.
中等难度的任务比太难或太易的任务更容易激励自己
D.
任务难度与努力程度没有关系
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