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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】The use of online learning at the high level is increasing significantly. Science courses being taught using 0nly text-based web pages are not achieving the desired learning result. A way to improve t...
A.
One of the groups
B.
C.
Both of the groups
D.
B. All of the groups
E.
F.
D. Neither of the groups
【单选题】Every summer Carol has a two-week vacation(假期). She usually travels (41) during her vacation and visits new places. Last August she (42) in Europe. Europe was very beautiful, (43) her vacation wasn’t ...
A.
[A] happily [B] happy [C] beautiful
【单选题】造成我国近海海域海水富营养化程度不断加重的主要原因是( )。
A.
大量生活污水和富含有机物的工业废水被直接排入大海
B.
渔业捕捞的失控
C.
近海的石油开采
D.
近大陆架消化污染的能力比较差