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【多选题】
品种是人类在一定的 ( )条件和 ( )条 件下，根据人类需要，通过选择、杂交、诱变等方法育成的，具有一定经济价值的某种栽培植物的群体。A.
生态
B.
自然
C.
经济
D.
社会
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【单选题】It can be inferred that even though the mailsters were small, uncomfortable, and dangerous, they could______.
A.
eliminate the need for relays
B.
carry handcarts and pouches as well
C.
be more protection than an umbrella
D.
reduce wear on shoes
【单选题】There is a small group of words which even some native speakers and writers of English find ______.
A.
puzzling
B.
to be puzzled
C.
to puzzle
D.
puzzle
【单选题】It is strange that the small boy _________ work out such a difficult exercise, which is even hard to settle for adults.
A.
should
B.
might
C.
could
D.
would
【单选题】Even in small companies, computers are a(n) ______tool.
A.
natural
B.
essential
C.
careful
D.
impossible
【单选题】下列有关运动说法错误的是（）
A.
当素材超出黑色范围内后，就不可能看到了
B.
定制并对路径进行修改，实际上是对关键帧的控制
C.
素材运动速度的改变实际上是素材延伸的修改
D.
时间线窗口上的关键帧和运动路径中的节点时不相对应
【单选题】Even in small companies, computers are a(n) tool.
A.
big
B.
small
C.
useful
D.
careful
【单选题】He said he was an insurance salesman, but later on she discovered he was a(n) ______.
A.
alien
B.
counterpart
C.
client
D.
fraud
【单选题】A small number of firms have stopped trading.
A.
hotels
B.
shops
C.
restaurants
D.
companies
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