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【单选题】
______ has been the major problem in the Great Lakes in recent years.
A.
Too many algae
B.
Excessive recreational use
C.
Lack of adequate rainfall
D.
Too much evaporation
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】In fact, Peter would rather have left for San Francisco than______ in New York.
A.
to stay
B.
stayed
C.
staying
D.
having stayed
【单选题】The old man should listen to the doctor' s suggestion that he ______ in bed.
A.
stay
B.
stays
C.
stayed
D.
staying
【单选题】According to Stokoe, sign language is ______
A.
a substandard language
B.
a genuine language
C.
an artificial language
D.
an international language
【单选题】By the time you get to New York, I______ for London.
A.
would be leaving
B.
am leaving
C.
have already left
D.
shall have left
【单选题】在混凝土配合比设计中，当无水泥28d抗压强度实测数据时，可利用水泥强度等级值乘以( )确定。
A.
水泥强度等级值的回归系数
B.
混泥土强度标准差
C.
水泥强度等级值的富余系数
D.
混凝土的含气量百分数