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【简答题】
如果A←B表示A是B的弟弟，则B一定是A的哥哥．______．
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举一反三
【简答题】接近传感器根据工作原理可分为( )和( )接近传感器。
【单选题】Organizations exist which try to make sure that someone sees when help is needed and does something about it. These organizations depend on voluntary help to carry out a wide variety of tasks, volunte...
A.
有一些机构设法确保人们知道有人需要帮助，并采取一定的措施。这些机构依靠志愿者牺牲一点自己的空闲时间提供帮助来开展各项服务工作。
B.
有一些机构没办法确保人们知道有人需要帮助，只能采取一定的措施。这些机构只能依靠志愿者牺牲一点自己的时间提供帮助来开展各项服务工作。
【单选题】There is a bridge _____ the river in front of my house. Let's go _____ it. [ ]
A.
on, through
B.
over, over
C.
above, through
D.
near, across
【单选题】—There are so many ______ over there. What’s happening? —Let’s go to have a look.
A.
flower
B.
car
C.
child
D.
people
【单选题】听力原文：Where should I put all these papers? (A) On the shelves over there. (B) Let' s move the cabinet. (C) At 7 o'clock. (11)
A.
B.
【单选题】—Class is over. —Look, _________ number of students are playing football there. Let’s go and join them.
A.
/
B.
a
C.
an
D.
the
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