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【单选题】

What can we learn about sun energy in the 20th century and 21st century?

A.
Solar output will reach its minimum in the 21st century.
B.
Solar output in the 20th century was the highest in history.
C.
Sunspot numbers in Cycle 24 has reached its peak in the 21st century.
D.
Sunspot numbers in Cycle 24 is less than half those in the 20th century. √
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参考解析:
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【单选题】5.0 There were _________ for Saturday.s movie.

A.
not available tickets
B.
no available tickets
C.
no tickets available
D.
tickets no available

【单选题】关于城镇排水系统的平面布置,以下哪一说法是错误的?( )

A.
直流正交式布置,只适用于雨水管道系统;
B.
截流式布置,既适用于分流制,又适用于合流制;
C.
在地形陡且坡向河流的地区,宜采用干管平行于等高线、主干管与等高线倾斜一定角度的布置方式。
D.
排水流域主要是根据管段敷设地区的用地性质划分的;