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【单选题】
已知一组数据的平均数为 , 若在这组数据中再添加一个数 , 则所得新数据的方差与原数据的方差相比较( ) .
A.
变大
B.
变小
C.
相等
D.
无法确定
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参考答案:
举一反三
【单选题】2019年中央农村工作会议强调,( )是全面小康的基本要求。
A.
农业发展
B.
全面脱贫
C.
农民增收
D.
生态优化
【单选题】对破伤风梭菌叙述正确的是
A.
通过伤口感染,细菌侵入血而致病
B.
革兰阴性菌,具周鞭毛
C.
不能形成芽胞
D.
芽胞抵抗力强
【简答题】A massive pool of warm ocean water is causing changes in the atmosphere that could produce unusual weather around ihc world in the next few months. the US National Weather Service reported on Monday. ...
【单选题】My clothes are not fashionable .
A.
lost
B.
new
C.
out of style
D.
worn out
【判断题】2019年中央农村工作会议强调,打赢脱贫攻坚战是全面建成小康社会的重中之重。
A.
正确
B.
错误
【单选题】Ihave worn out my trousers, so I want to buy a new ______
A.
pair
B.
one
C.
ones
D.
trousers
【单选题】There ______ a pair of trousers on the table.My trousers ______ worn out.
A.
is, are
B.
are, are
C.
is, is
D.
have, have
【简答题】 dialogues based on the following situation. Mary White swims every day so she cares about the swimming pool in the hotel very much. She wants to know whether the temperature of the water is com...
【单选题】The following paragraph of an event involves the description of:A girl on my daughter’s team jumped in the pool, grabbed the sock, and swam after Elizabeth. She grabbed Elizabeth’s foot. “You have to ...
A.
Scenes
B.
Actions
C.
Feelings and emotions
D.
/
【单选题】We sat on the edge of the pool with our legs dangling in the water.
A.
soaking
B.
treading
C.
bathing
D.
hanging
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